Money and Banking Chapter 7 Rational Expectations, Efficient Markets, and the Valuation of Corporate Equities

Chapter Rational Expectations , Efficient Markets , and the Valuation of Corporate Equities CHAPTER OBJECTIVES By the end of this chapter , students should be able to . Explain when expectations are rational and when they are irrational . Explain how corporate equities ( stocks , shares of a corporation ) are valued . Explain what is meant by the term market . Describe the ways in which financial markets are efficient . Describe the ways in which financial markets are inefficient . URL books 131

The Theory of Rational Expectations LEARNING OBJECTIVE . When are expectations rational and when are they irrational ?

Market volatility , the constantly changing prices of instruments , some people into thinking that markets , especially stock markets , are or gigantic roulette wheels . Stock prices , they suspect , are at best random and at worst rigged . In fact , markets are more efficient , and hence fairer , than other markets . The direction of price movements ( up or down ) is indeed random , but price levels are based on the rational expectations of a large number of market participants . While scams certainly exist , the stock and bond markets are not rigged . Except perhaps for some penny stocks , securities prices are usually based on economic fundamentals and are not systematically manipulated by insiders or conspirators . Investing in corporate equities certainly entails risk , but it is not akin to playing the lottery . Luck can play a role in investing , as in anything in life , but unlike a Powerball drawing , Lady Luck is not the whole of the game by a long shot . Far from being gamblers , investors are switches in the most advanced computing devices in the history of the world , markets . Prices in those markets help to determine what gets made and what doesn , how much gets produced and how , and where and how those goods are sold . Financial markets , in the worlds most economically advanced countries anyway , have been rational and machines for many centuries . In 1688 , a broker in Amsterdam , Netherlands , named Joseph de la Vega , left posterity with vivid descriptions of the Dutch securities market . The market , he claimed , was just a game of misinformation and spin management that pitted bulls ( those who profited from an increase in prices ) against bears ( those who from a decrease in prices ) The bulls are like the which is scared by nothing . They love everything , they praise everything , they exaggerate everything . The bulls make the public believe that their tricks signify wealth and that crops grow on graves . When attacked by serpents , they . regard them as both a delicate and a delicious meal . They are not impressed by by a debacle . The bears , on the contrary , are completely ruled , trepidation , and URL books 132

nervousness . Rabbits become elephants , brawls in a tavern become rebellions , faint shadows appear to them as signs . What is there miraculous about the likelihood that every become a giant in the eyes ofthe bears ?

Joseph de la Vega went on to detail a dozen different ways in which of bears and herds of bulls tried to securities prices . The net effect of such machinations , though , was unclear . Sometimes the bulls won , sometimes the bears won , but their activities often canceled each other out . Numerous brokers are inexhaustible in inventing involved maneuvers , de la Vega explained , but for just this reason do not achieve their Systematic manipulation of the market was impossible because the bulls and bears competed against each other , each tugging at the price , but ultimately in vain . Also , as rational investors learned the tricks of trading , they came to expect hyperbole , false rumors , sham sales , and the like . So , in the final analysis , market fundamentals , not the whims of nefarious individuals , determined prices . Exactly the same could be said of most of today securities speaking , stock and other securities prices due to genuine changes in supply or demand , not because ofthe machinations and bears . Joseph de la Vega description of what was then the world most advanced securities market also made clear that expectations , rather than , moved prices . The expectation of an event , he noted , creates a much deeper impression upon the exchange than the event As noted in the preceding chapters , expectations are still paramount today . People invest based on what they believe the future will bring , not on what the present brings or the past has wrought , though they often look to the present and past ( sometimes even the distant past ) for clues about the future . Rational expectations theory posits that investor expectations will be the best guess of the future using all available information . Expectations do not have to be correct to be rational they just have to make logical sense given what is known at any particular moment . An expectation would be irrational if it did not logically follow from what is known or if it ignored available information . For the former reason , investors expend considerable sums on schooling , books , lectures , seminars , and the like , to learn the best ways to reason correctly given certain types of information . This textbook and course are a good start , but competition for the best model is keen . Investment models and strategies constantly morph , adapting to changes in the real world . For the latter reason , investors URL books 133

update their expectations , or forecasts , with great frequency , as new information becomes available , which occurs basically 365 . If everyone expectations are rational , then why don investors agree on how much assets are worth ?

One investor may think gold a steal at , while another wouldn touch the stuff for a penny over 750 . One investor might think just right for a zero coupon bond , but another might think it a good deal only at . One may think that XY stock is overpriced at a share , while another would buy a small quantity of it at that price , and yet another would buy all she could at that price . Such in valuation are important because they allow trades to occur by inducing some investors to sell and others to buy . As it turns out , investors sometimes have sets of information available to them . Some investors may have inside information , news that is unknown outside a small circle . Others may lack certain types of information because they think it is too costly to obtain . Other times , investors think ofthe information they know in common because their ( their goals and aspirations , if you will ) So they have different time horizons , different holding periods , and different sensitivities to risk . At yet other times , investors use different valuation models , different theories of how to predict fundamentals most accurately and how those fundamentals determine securities prices . For example , some investors foresee long causal chains more clearly than other investors do . Recall from Chapter The Economics of Fluctuations that the demand for asset is partly a function of its expected return relative to all assets . So investors must consider information directly related to asset and all other assets . A new piece of information half a world away that alters expectations about a nation ability to repay its debts , a sector future prospects , or a single company regularly ripples through the entire financial world . Ripple indeed evokes the right metaphor . Like throwing a pebble into a pond , the disruption is greatest at the epicenter , the spot where the rock hits the water , but it dissipates over time and space . The bigger the pebble ( the bigger the news ) the bigger the splash and the larger and longer lasting the disruption . Most days , the world financial pond is pelted with millions of little pebbles , little pieces of news that cause prices to jiggle up and down . Every now and again , a big stone , even a boulder , hits the pond , causing URL books ' 134

significant price changes throughout the pond for quite a long time . Economists call such boulders shocks , and they include crises like that of . Financial crises almost always follow asset bubbles , which we will discuss in more detail below . Some investors understand the effect of some ripples more quickly and clearly than others . This shouldn be taken to mean that some investors are smarter than others , only that they understand the types of ripples particular pebbles will make better than others do . The roles could reverse with the next pebble , with the next bit of news . Moreover , investors constantly strive to improve their understanding of the ways that certain types of news affect securities prices . They emulate successful people and develop new models and theories of their own , not for the joy of learning but for the clink of cold hard cash . For example , investors who understood that oil prices hitting 50 per barrel would increase the share price of home insulation manufacturers merely stayed up with the crowd . It pretty obvious that higher home heating costs would induce people to buy insulation . The investors who quickly figured out that the share price of a Canadian shingle manufacturer would jump too were the ones that earned returns . High oil prices made it to extract oil from Canada oil sand fields , but not enough people lived in the area around Fort , to meet labor demands . People to the region to work needed new homes , the roofs of which needed shingles , lots of them . For all those reasons , investors often have a wide variety of opinions about the value of different assets . More mechanically , investors might have different opinions about bond valuations because they must have different views about the applicable discount or interest rate . To review , If this is a zero coupon bond , and i , then the bond price ( But if one believes i , then the bond price ( To understand how investors can value the same stock differently , we must investigate how they value corporate equities . KEY TAKEAWAYS Expectations are rational when they logically follow from all available relevant information . URL books 135

Expectations are irrational if some available pertinent information is ignored or if conclusions do not flow logically from available information . wiki Jose Joseph de la Vega , Confusion de . URL books 136 Valuing Corporate Equities LEARNING OBJECTIVE . How are corporate equities valued ?

A corporate equity , or stock , is sometimes called a share because it is just that , a share in the ownership of a corporation . Ownership entitles investors to a say in how the corporation is run . Today that usually means one vote per share in corporate elections for the board of directors , a group of people who direct , oversee , and monitor the corporations professional managers . Ownership also means that investors are residual claimants , them to a proportionate share ofthe corporation net earnings ( its , and its assets once all other claims against it have been settled . In exchange for their investment , stockholders may receive a of cash payments , usually made quarterly , called dividends . Dividends differ from bond coupons in important ways . Unlike coupons , they are not . They may go up or down over time . Also , if a company fails to pay dividends on its stock , it is not considered in default . We speak here of common stock . Another type of instrument , a preferred share preference shares in the United Kingdom , promises to pay a dividend . Such instruments are a type of hybrid and are priced more like coupon bonds . In fact , many corporations today do not pay any dividends , and for good reasons . Small , rapidly growing companies , it is widely believed , should plow their back into their businesses rather than return money to shareholders . That is not cheating the stockholders , because left with the company instead of paid out as dividends raise the share price . The company has more cash than it otherwise would , after all , and stockholders own the whether they are left with the company or put into their pockets . Plus , it is generally thought that growing companies put the money to more use than stockholders could . There is a tax to retaining earnings , too . Taxes on dividends , which Revenue Service ( IRS ) considers income , are usually higher than taxes on share appreciation , which the IRS considers capital gains . Also , dividends are taxed in the year they are paid , which may be inconvenient for stockholders , but capital gains taxes are incurred only when the URL books 137

stockholders sell their shares , so they have more control over their tax liabilities . Similarly , companies that have stopped growing will sometimes buy their own stock in the market rather than pay dividends . Fewer shares outstanding means that each share is worth more ( the price per share equals the total value of the company divided by the number of shares , so as the denominator declines , the price per share increases ) so stockholders are paid with a higher stock price . Nevertheless , some corporations continue to pay dividends . The point here is that what really matters when valuing corporate equities is earnings because , as noted above , they belong to the stockholders whether they are divided , kept as cash , or used to repurchase shares . The simplest stock valuation method , the valuation model , simply calculates the discounted present value and selling price over a holding period ( where price now yearly earnings or required rate of return expected price at year end So if a company is expected to earn no profit , its share price is expected to be 75 at the end of the year , and the required rate of return on investments in its risk class is 10 percent , an investor would buy the stock if its market price was at or below . Another investor might also require a 10 percent return but think the stock will be worth 104 at the end of the year . He pay for the stock today ! A third investor might agree with the , that the stock will be worth 75 in a year , but she might need a 12 percent return . She pay only up to per share . Yet another investor might also require a 12 percent return to hold the stock and think 75 a reasonable price a year from now , but he might also think earnings of per share is in the offing . He pay per share . For a little practice , complete the following exercises now . URL books 138

EXERCISES . Use the valuation model ( to price the following stocks ( remember to decimalize percentages ) I II . I I I ' 041 ) 10 20 15 20 20 20 20 30 40 10 50 10 50 10 50 10 . For longer holding periods , one can use the generalized dividend valuation model , which discounts URL earnings to their present value . That can be done mechanically , as we did for coupon bonds in Chapter Interest Rates , or with a little fancier math . That sideways means infinity . So this equation basically says that the price of a share now is the sum ( of the discounted present values of the expected earnings between now and infinity . The neat thing about this equation is that the expected future sales price of the stock drops out of the equation because the present value of any sum at any decent required rate of return quickly becomes negligible . For example , the present value of an asset expected to be worth 10 in 20 years at 15 percent interest is only ( today . So for all intents and purposes in this model , a corporate equity is worth the discounted present value of its earnings stream . where price today books 139

. most recent earnings required return 10 . constant growth rate So the price of a stock today that recently earned per share and has expected earnings growth of percent would be if the required return was 10 percent ( If another investor estimates either or differently , perhaps because he knows more ( or less ) about a country , industry , or company future prospects , will of course change , perhaps radically . Exercise demonstrates this and will give you some practice with the Gordon growth model . decimalize percentages ) Use the Gordon growth model Ex ( to value the following stocks ( remember to Stop and Think Box lI ) up ( Rule ( Val or ' 10 15 20 10 10 10 30 30 10 30 15 100 20 10 Stock prices plummeted after the terrorist attacks on . Use the Gordon growth model to explain why . Stock prices plummeted after because risks increased , raising , and because expectations of corporate dropped , decreasing So the numerator of the Gordon growth model decreased and the denominator increased , both of which caused to decrease . KEY TAKEAWAYS URL books 140

In general , corporate equities are valued the same way that any financial security is , by discounting expected future cash flows . With stocks , corporate earnings replace actual cash payments because shareholders own profits , whether they receive them as cash dividends or not . The formula for valuing a stock to be held one year , called the valuation model , is ( where is expected earnings , is the expected sales price of the stock next year , and is the return required to hold the stock given its risk and liquidity characteristics . In the Gordon growth model , earnings are assumed to grow at a constant rate forever , so stock values can be estimated without guessing the future sales price by using the following formula ( where the most recent earnings , the rate of earnings growth , the required return where URL books 141

Financial Market Efficiency LEARNING OBJECTIVE . In what senses can financial markets be efficient or inefficient ?

Now here is the freaky thing . While at any given moment , most investors valuations are wrong ( too low or too high ) the market valuation , given the information available at that moment , is always correct , though in a tautological or circular way only . You may recall from your principles course that markets discover prices and quantities . If the market price of anything differs from the equilibrium price ( where the supply and demand curves intersect ) market participants will bid the market price up or down until equilibrium is achieved . In other words , a good , including a financial security , is worth precisely what the market says it is worth . At any given time , some people expect the future market price of an asset will move higher or that it is currently , a value or bargain , so to speak . They want to buy . Others believe it will move lower , that it is currently overpriced . They want to sell . Sometimes the buyers are right and sometimes the sellers are , but that is beside the point , at least from the viewpoint of economic efficiency . The key is that the investor who values the asset most highly will come to own it because he be willing to pay the most for it . Financial markets are therefore . In other words , markets reign , assets are put to their most highly valued use , even market participants don know what that use or value is . That really remarkable when you think about it and goes a long way to explaining why many economists grow hot under the collar when governments create barriers that restrict information or asset transfers . Financial markets are also efficient in the sense ofbeing highly integrated . In other words , prices of similar securities track each other closely over time and prices of the same security trading in different markets are identical , or nearly so . Were they not , arbitrage , or the riskless opportunity that arises when the same security at the same time has in markets , would take place . By buying in the low market and immediately selling in the high market , an investor could make easy money . as soon as an arbitrage opportunity appears , it is immediately exploited until it is no longer profitable . Buying in the low market raises the price URL books 142

there , while selling in the high market decreases the price there . Therefore , only slight price differences that do not exceed transaction costs ( brokerage fees , spreads , etc . persist . The size of those price and the speed with which arbitrage opportunities are closed depend on the available technology . Today , institutional investors can complete international market trades in just seconds and for just a few hundredths or even thousandths of a percent . In the early nineteenth century , investors who engage in arbitrage ) confronted lags of several weeks and transaction costs of several percent . Little wonder that price differentials were larger and more persistent in the early nineteenth century . But the early markets were still rational because they were as efficient as they could be at the time . Perhaps in the future , new technology will make seconds and hundredths of a percent look pitifully archaic . Arbitrage , or the lack thereof , has been the source of numerous jokes and gags , including a episode of the comedy sitcom . In the episodes , Cosmo Kramer and his rotund friend Newman ( the postal worker ) decide to try to arbitrage the deposit on cans and bottles of soda , which is cents in New York , where and his goofy friends live , and 10 cents in Michigan . The two friends load up Newman postal truck with cans and head west , only to discover that the transaction costs ( fuel , tolls , hotels , and what not ) are too high , especially given the fact that Kramer is easily sidetracked . transaction costs also explain why people don arbitrage the international price of Big Macs and many other physical things . Online sites like eBay , however , have recently made arbitrage in more possible than ever by greatly reducing transaction costs . In another joke ( at least I hope it a joke ! two economics professors think they see an arbitrage opportunity in wheat . After carefully studying all the transaction , insurance , brokerage , weighing fees , foreign exchange volatility , weight lost in transit , even the interest on money over the expected shipping conclude that they can make a bundle buying low in Chicago and selling high in London . They go for it , but when the wheat arrives in London , they learn that a British ton ( long ton , or pounds ) and a ton ( short ton , or pounds ) are not the same thing . only appeared to be lower in Chicago because a smaller quantity was being priced . URL books 143

Some economists believe markets are so that unexploited opportunities like arbitrage are virtually impossible . Such extreme views have also become the butt of jokes , like the one where an assistant professor ( young , of economics bends over to pick up a 20 bill off the sidewalk , only to be chided by an older , wiser , indubitably tenured colleague who advises him that if the object on the ground were real money , somebody else would have already have picked it up . As somebody who once found a real 50 bill on a New York City sidewalk , I ( Wright ) know that money is sometimes lost and that somebody has to be lucky enough to pocket it . But as somebody who once stuck his hand in a toilet to get what looked like a 20 bill , I also know that things are not always what they seem . Hey , I was young . Arbitrage and other unexploited opportunities are not unicorns . They do exist on occasion . But especially in markets , they are so that they might best be compared to or , rare and subatomic particles . In an efficient market , all unexploited opportunities , notjust arbitrage opportunities , will be eliminated as quickly as the current technology set allows . Say , for example , the rate of return on a stock is 10 percent but the optimal forecast or best guess rate of return , due to a change in information or in a valuation model , was 15 percent . Investors would quickly bid up the price of the stock , thereby reducing its return . Remember that ( As , the price now , increases , must decrease . Conversely , if the rate of return on a stock is currently 10 percent but the optimal forecast rate of return dropped to percent , investors would sell the stock until its price decreased enough to increase the return to 10 percent . In other words , in an market , the return and the current equilibrium return are one and the same . Financial market efficiency means that it is or impossible to earn abnormally high returns at any given level of risk . Remember , returns increase with risk . Yes , an investor who invests 100 percent in hedge funds will likely garner a higher return than one who buys only Treasury notes . Holding risk ( and liquidity ) constant , though , returns should be the same , especially over long periods . In fact , creating a stock portfolio by throwing darts at a dartboard covered with ticker symbols returns as much , on average , as the choices of experienced stock pickers choosing from the same set of companies . Chimpanzees and orangutans have also done as well as the darts and the experts . Many studies have shown that actively managed mutual funds do not systematically URL books 144

outperform ( provide higher returns than ) the market . In any given period , some funds beat the market handily , but others lag it considerably . Over time , some stellar performers turn into dogs , and vice versa . That is why regulators force to remind investors that past performance is not a guarantee of future returns . Stop and Think Box Wright once received the following hot tip in his Saturday , March 17 , 2007 Dear Friend Ifyou give me permission . show you how to make money in a sector , starting 600 . The are enormous . You can start with as little as 300 . And more , there is absolutely no risk because you will Test Drive the system before you shell out any money . So what is this secret sector that you can get in on 600 or less ?

Dear Friend , it called penny that cost less than per share . one time was a penny stock . So was . And not too long age , America Online was cents a share , and Yahoo was only a stock . These are not rare and isolated examples . Every month people buy penny stocks at bargain prices and make a within a short time . Very recently , these stocks made huge . In January ARGON was at . Our indicators picked up the beginning ofthe upward move ofthis stock . Within three months the stock shot up to a share , turning a 300 investment into injust three months . In November ( was at a share . the decline ofthis 13 to as little as a share . But our were showing an upward move . Stock went up to a share . An investment 500 would have a net gain . Micro Devices was at in August 1999 . It exploded to a share by April 2000 . An investment 500 in this stock would have a . Infact , are huge in penny stocks . And smart investors who picked these penny stocks made huge URL books 145

. They watched their money double seemingly day after day , week after week , month after month . Double , triple , quadruple , and more . Should Wright buy ?

Why or why not ?

Wright should not invest . If the individual who sent the message really knows that the stock is going to appreciate , why should he tell anyone ?

Shouldn he buy the shares himself , borrowing to the hilt if necessary to do so ?

So why would he try to entice me to buy this stock ?

He probably owns a few ( hundred , thousand , million ) shares and wants to drive their price up by suckers and fools to buy it so he can sell . This is called pumping and dumping and it runs afoul of any number of laws , rules , and regulations , so you shouldn think about sending such yourself , unless you want to spend some time in Martha Stewart prison . And don think you can on the game , either . One quirky fellow named Joshua actually tracks the prices of the hot stock tips he has received , pretending to buy shares of each . On one day in March 2007 , his Web site claimed that his pretend investment of was then worth a whopping , a net gain of . To out how he is doing now , browse . Even if he had bought and sold almost immediately , he would have still lost money because most stocks experienced very modest and pops followed by quick . A few of us are idiots , but most are not ( or we are too poor or too lazy to act on the tips ) Learning this , the scammers started to pretend that they were sending the message to a close friend to make it seem as though the recipient stumbled upon important inside information . For a hilarious story about this , news story ?

Beware , because their ruses are likely to grow increasingly sophisticated . In some ways , darts and apes are better stock pickers than people because the fees and transaction costs associated with actively managed funds often erase any superior performance they provide . For this reason , many economists urge investors to buy passively managed or exchange traded funds ( indexed to broad markets , like the or the Dow Jones Industrial Average , because they tend to have the lowest fees , taxes , and trading costs . Such funds win by not losing , providing investors with an inexpensive way of diversifying risk and earning the market rate of return , whatever that happens to be over a given holding period ( time frame ) URL books 146

KEY TAKEAWAYS Markets are efficient if they allocate resources to their most highly valued use and if excess profit opportunities are rare and quickly extinguished . Financial markets are usually efficient . In other words , they ensure that resources are allocated to their most highly valued uses , and outsized profits ( as through arbitrage , the instantaneous purchase and sale of the same security in two different markets to take advantage of price differentials ) are uncommon and disappear rapidly . Bottle Deposit , Part research 123 URL books 147

Evidence of Market Efficiency LEARNING OBJECTIVE . How efficient are our markets ?

Sophisticated statistical analyses of stock and other securities prices indicate that they follow a random That is why stock charts often look like the path of a drunk staggering home after a party , just as in Figure Sample random series . As noted at the beginning of this chapter , securities prices in efficient markets are not random . They are determined by fundamentals , particularly interest rate , and expectations . What is random is their direction , up or down , in the next period . That because relevant news can not be systematically predicted . If it could , it wouldn be news . technical analysis , the attempt to predict future stock prices based on their past behavior , is therefore largely a chimera . On average , technical analysts do not outperform the market . Some technical analysts do , but others do not . The differences are largely a function of luck . The fact that technical analysts and actively managed funds persist , however , suggests that markets are still far short of perfect efficiency . Figure 25 ' 20 15 10 15 10 20 so 40 so so 70 so 90 100 URL books If ) 148

In fact , in addition to , economists talk about three types of market weak , and strong . These terms are described in Figure Types of . Today , most markets appear to be at best . As it turns out , that pretty good . Figure Types of Some markets are more efficient than others . Thanks to technology improvements , today markets are more ( though not necessarily more rational ) than those of yore . In every age , markets tend to be more than real estate markets , which in turn tend to be more than commodities markets and labor and many services markets . That because instruments tend to have a very high value compared to their weight ( indeed they have no weight whatsoever today ) are of uniform quality ( a given share of is the same as any other share ) and are little subject to wastage ( you could lose bearer bonds or cash , but most other instruments are registered , meaning a record of your ownership is kept apart from physical possession of the instruments themselves ) Most commodities are relatively bulky , are not always uniform in quality , and deteriorate over time . In fact , futures markets have arisen to make commodities markets ( for gold , wheat , orange juice , and many others ) more . Financial markets , particularly mortgage markets , also help to improve the of real estate markets . Nevertheless , considerable persist . As the Wall Street Journal reported in March 2007 , URL books

it was possible to make outsized by purchasing homes sold at foreclosure , tax , and other auctions , then selling them at a hefty profit , accounting for transaction costs , without even going through the trouble or expense of them up . That is nothing short of real estate arbitrage ! Labor and services markets are the least of all . People won or can move to their highest valued uses they adapt very slowly to technology changes and myriad regulations , some imposed by government and others by labor unions , limit their on the ob . Some improvements have been made in recent years thanks to global outsourcing , but it is clear that the number of unexploited opportunities in labor markets far exceeds those in the markets . Finally , markets for education , healthcare , and custom construction services are also highly inefficient , probably due to high levels of asymmetric information , a subject addressed in more detail below and in Chapter Financial Structure , Transaction Costs , and Asymmetric Information . Stop and Think Box A friend urges you to subscribe to a certain reputable investment report . Should you buy ?

Another friend brags about the huge returns she has made by buying and selling stocks frequently . Should you emulate her trading strategies ?

Buying an investment report makes more sense than following the unsolicited hot stock tip discussed above , but it still may not be a good idea . Many legitimate companies try to sell information and advice to investors . The value of that information and advice , however , may be limited . As we learn in Chapter Financial Structure , Transaction Costs , and Asymmetric Information , the information may be tainted by of interest . Even if the research is unbiased and good , by the time the newsletter reaches you , even if it is electronic , the market has probably already priced the information , so there will be no market profit opportunities remaining to exploit . In fact , only one investment advice newsletter , Value Line Survey ( has consistently provided advice that leads to abnormally high returns . It isn clear if has deeper insights into the market , if it has simply gotten lucky , or if its mystique has made its predictions a prophecy investors believe that it picks super stocks , so they buy its recommendations , driving prices up , just as it predicted ! The three explanations are not , in fact , mutually exclusive . Luck and skill may have created the mystique underlying continued success . URL books 150

As far as emulating your friend trading strategies , you should investigate the matter more thoroughly . For starters , people tend to brag about their gains and forget about their losses . My Wright father , who liked to bet the ponies , was infamous for this . He get us excited by telling us he won at the track that day . When we asked why we were eating squirrels for dinner again , he give in and admit that he also lost . Even if your friend is genuinely successful at picking stocks , she is likely just getting lucky . Her luck could turn just as your money gets in the game . To the extent that markets are , investors are better off choosing the level of risk they are comfortable with and earning the market return . That usually entails buying and holding a diverse portfolio via an indexed mutual fund , which minimizes taxes and brokerage fees , both of which can add up . index investors also waste less time tracking stocks and worrying about market . As noted above , none of this should be taken to mean that financial markets are perfectly efficient . Researchers have uncovered certain anomalies , situations where it is or was possible to outperform the market , holding risk and liquidity constant . I say was because exposing an anomaly will often induce investors to exploit it until it is eliminated . One such anomaly was the January Effect , a predictable rise in stock prices that for many years occurred each January until its existence was recognized and publicized . Similarly , stock prices in the past tended to display mean reversion . In other words , stocks with low returns in one period tended to have high returns in the next , and vice versa . The phenomenon appears to have disappeared , however , with the advent of trading strategies like the Dogs of the Dow , where investors buy stocks in the knowledge that they can only go up ( though a few will go to zero and stay there ) Other anomalies , though , appear to persist . The prices of many securities , including stocks , tend to overshoot when there is unexpected bad news . After a huge initial drop , the price often meanders back upward over a period of several weeks . This suggests that investors should buy soon after bad news hits , then sell at a higher price a few weeks later . Sometimes , prices seem to adjust only slowly to news , even highly announcements about corporate profit expectations . That suggests that investors could earn returns by buying immediately on good news and selling after a few weeks when the price catches up to the news . URL books 151

Some anomalies may be due to in our understanding and liquidity rather than market . One of these is the effect . Returns on smaller companies , apparently holding risk and liquidity constant , are abnormally large . Why then don investors to such companies , driving their stock prices up until the outsized returns disappear ?

Some suspect that the companies are riskier , or at least appear riskier to investors , than researchers believe . Others believe the root issues are asymmetric information , the fact that the quality and quantity of information about smaller firms is inferior to that of larger ones , and inaccurate measurement of liquidity . Similarly , some researchers believe that stock prices are more volatile than they should be given changes in underlying fundamentals . That too might stem from the fact that researchers aren as prescient as the market . The most important example market are asset bubbles or manias . Periodically , market prices soar far beyond what the fundamentals suggest they should . During stock market manias , like the bubble of the late , investors apparently popped sanguine values into models like the Gordon growth model or , given the large in prices , large , values into the valuation model . In any event , starting in March 2000 , the valuations for most of the shares were discovered to be too high , so share prices rapidly dropped . Bubbles are not necessarily irrational , but they are certainly to the extent that they lead to the when prices are rising and unexploited opportunities when prices head south . Asset bubbles are very common affairs . Since the tech bubble burst , we ve already experienced another , in housing and home mortgages . Recurrent investor euphoria may be rooted in the deepest recesses of the human mind . Whether we evolved from the great apes or were created by some Divine Being , one thing is clear our brains are pretty scrambled , especially when it comes to probabilities and percentages . For example , a recent study published of Finance showed that investors , even sophisticated ones , expect less change in future stock prices when asked to state their forecasts in currency ( so many dollars or euros per share ) than when asked to state them as returns ( a percentage gain or loss ) URL books 152

Behavioral finance uses insights from evolutionary psychology , anthropology , sociology , the , and psychology to try to unravel how the human brain functions in areas related to . 10 For example , many people are averse to short selling , selling ( or borrowing and then selling ) a stock that appears overvalued with the expectation of buying it back later at a lower price . Short sellers profit by owning more shares of the stock , or the same number of shares and a sum of cash , depending on how they go about it . A dearth of short selling may allow stock prices to spiral too high , leading to asset bubbles . Another human foible is that we tend to be overly in our own judgments . Many actually believe that they are smarter than the markets in which they trade ! As noted above , many researchers appear to fall into the same trap . People also tend to herd . They will , like the common misconception about lemmings , run with the crowd , seemingly oblivious to the cliff looming just ahead . Finally , as noted above , another source of in ( and nonfinancial ) markets is asymmetric information , when one party to a transaction has better information than the other . Usually , the asymmetry arises due to inside information as when the seller , for instance , knows the company is weak but the buyer does not . Regulators try to reduce information by outlawing outright fraud and by encouraging timely and disclosure of pertinent information to the public . In short , they try to promote what economists call transparency . Some markets , however , remain quite opaque . 11 In short , our markets appear to be form . Greater transparency and more fervent attempts to overcome the natural limitations of human rationality would help to move the markets closer to strong form efficiency . KEY TAKEAWAYS Beyond efficiency , markets may be classed as weak , or strong form efficient . If the market is weak form efficient , technical analysis is useless because securities prices already reflect past prices . If the market is form efficient , fundamental analysis is also useless because prices reflect all publicly available information . URL books 153

If the market is strong form efficient , inside information is useless too because prices reflect all information . Securities prices tend to track each other closely over time and in fact usually display random walk behavior , moving up and down unpredictably . Neither technical analysis nor fundamental analysis the market on average , but inside information apparently does , so most financial markets today are at best form efficient . Although more efficient than commodities , labor , and services markets , financial markets are not completely efficient . Various anomalies , like the January and effects , market overreaction and volatility , mean reversion , and asset bubbles , suggest that securities markets sometimes yield outsized gains to the quick and the smart , people who overcome the mushy , often illogical brains all humans are apparently born with . But the quest is a one no strategy works for long . Any share of the same class , that is . As noted above , some corporations issue preferred shares , which differ rom the common shares discussed in this chapter . Other corporations issue shares , usually Class A or Class , that have different voting rights . James , Foreclosure Rise Brings Business to One , March 14 , 2007 , at ep ?

ie books Markus , Thomas Langer , Jens , and Martin Weber , Framing Effects in Stock Market Forecasts The Differences Between Asking for Prices and Asking for Returns , Review ( 2007 ) This is a new example ofthe framing effect . Predict the future stock price of a stock that goes from 35 to 37 to 39 to 41 to 43 to 45 . Now predict the future stock price of a stock whose returns are , and . If you are like most people , your answer to the first will be less than 45 but your answer URL books 154

to the second will be even though both series provide precisely the same information . In other words , the way a problem is set up or framed influences the way people respond to it . 10 11 URL books 155 Suggested Reading , Peter . Against the Gods The Remarkable Story of Risk . John Wiley and Sons , 1998 . Terry . Mean Markets and Lizard Brains How to from the New Science of Irrationality . John Wiley and Sons , 2008 . English , James . Applied Stock Valuation Techniques for Wall Street Professionals . New York , 2001 . Charles , and Joseph de la Vega . Extraordinary Popular Delusions and the Madness of Crowds and Confusion de . John Wiley and Sons , 1995 . Burton . A Random Walk Down Wall Street The Strategy for Successful Investing , ed . New York Norton , 2007 . URL books 155