clearly irrational financial market behavior evidence from the early exercise of exchange traded stock options this paper analyzes the early exercise of exchange traded options by different classes of investors over the 1996 to 1999 period a large number of exercises are identified as clearly irrational without invoking any model of market equilibrium customers of discount brokers and customers of full service brokers both engage in a significant number of irrational exercises while traders at large investment houses exhibit no irrational early exercise behavior rational and irrational exercise is triggered for discount and full service customers by the underlying stock price attaining its highest level over the past year and by high returns on the underlying stock it is well known that in the absence of market frictions it is irrational to exercise american call options early except in some circumstances just before the underlying stock goes ex dividend even in the presence of market frictions it is possible to identify without the imposition of any model of market equilibrium call exercises that are clearly irrational in this paper we employ a previously unavailable data set to analyze the rationality of early exercises of chicago board option exchange cboe calls over the 1996 to 1999 period by customers of discount brokers discount customers customers of full service brokers full service customers and traders at large investment houses trading for their firms own accounts firm proprietary traders our first main finding is that there are a large number of early exercises that can be definitively identified as irrational and irrational exercise activity is not evenly distributed across the investor classes discount customers and full ser

how does the stock market absorb shocks abstract using a comprehensive set of news stories we find a stark difference in market responses to positive and negative price shocks accompanied by new information when there is a news story about a firm positive price shocks are followed by reversal while negative ones result in drift this is interpreted as the stock market overreaction to good news and underreaction to bad news these seemingly contradictory results can be explained in a single framework considering the interaction of retail investors with attention bias and arbitrageurs with short run capital constraints consistent with this hypothesis we find that both patterns are stronger when the attention bias is stronger and when the arbitrage capital is scarce

evaluating interval forecasts a complete theory for evaluating interval forecasts has not been worked out to date most of the literature implicitly assumes homoskedastic errors even when this is clearly violated and proceed by merely testing for correct unconditional coverage consequently i set out to build a consistent framework for conditional interval forecast evaluation which is crucial when higher order moment dynamics are present the new methodology is demonstrated in an application to the exchange rate forecasting procedures advocated in risk management

anchoring on historical high prices and seasoned equity offerings we document that firms financing decisions are affected by historical high prices the ratio of the monthly high price to the 12 month historical high price positively affects the probability of a seasoned equity offering seo furthermore the postannouncement market reaction is muted and the offering discount is smaller if the preannouncement stock price is high relative to its historical high price the results suggest that historical high price reference points may help managers rationally time seos to take advantage of market reception and minimize issuance costs

psychological factors and stock option exercise we investigate stock option exercise decisions by over 50 000 employees at seven corporations controlling for economic factors psychological factors influence exercise consistent with psychological models of beliefs employees exercise in response to stock price trends exercise is positively related to stock returns during the preceding month and negatively related to returns over longer horizons consistent with psychological models of values that include reference points employee exercise activity roughly doubles when the stock price exceeds the maximum price attained during the previous year

exercise behavior valuation and the incentive effects of employee stock options abstract we use a large database on eso exercises to document characteristics of exercise behavior and calibrate a utility based model for measuring how differences in exercise behavior are manifested in option values and incentives option values and incentives computed from the model calibrations are compared to those computed from models used to value tradable options our analysis provides guidance to both academics and practitioners about how differences in exercise behavior and model choice affect measures of eso values and incentives and underscores the importance of gaining a thorough understanding of the underlying economic forces that affect the behavior of eso holders

a general framework for evaluating executive stock options abstract motivated by recent recommendations by both european and american accounting standards boards that executive stock options be expensed in firms statements we provide an analytical and flexible framework for their evaluation our approach takes into account the vesting period american style resetting and reloading provisions that are features of many option programs and also considers the trading restriction on executives we identify a recursive structure in the stream of options that are granted to the executive over the course of her employment by exploiting this we are able to obtain a near explicit formula for the option value this enables us to discuss the joint effects of the different features on the exercising strategies and firms granting cost especially we highlight some significant interactions among these features

the effects of endowment and loss aversion in managerial stock option valuation assuming a positive influence of stock price volatility on stock option value incentive alignment proponents argue that stock option compensation encourages managerial risk seeking and thus aligns managers and shareholders risk preferences our findings show that stock option holders overvalue unexercisable options relative to options being offered and to normative e g black scholes valuations further the influence of stock price volatility on holders subjective valuations depends on stock price trend in sum results suggest that during stock option valuation managers draw on heuristics that financial options theory and models fail to capture we discuss implications for compensation design and research

broad based employee stock options grants and ipo firms this paper examines the broad based grant of employee stock options esos in the period following the initial public offering ipo stock option grants are used to reduce the negative effects of conflicts of interests associated with a firm s going public the study documents that option grants can be seen as corporate governance instruments for a number of model specifications also it is found that there is a robust relation between option grants and market and accounting returns respectively to the best of the authors knowledge no previous study has investigated the determinants of the grants of employee stock options in the post ipo period to both upper level and lower level executives during a period of sixteen years because the cross sectional data of this study amply encompasses more than a business cycle it is possible to examine the grants of esos across tight and soft labour markets during the former type of labour market it appears that more options are granted also the empirical res

revisiting the incentive effects of executive stock options abstract we develop a multiperiod framework to evaluate the incentive effects of executive stock options esos for a given increase in the grant date firm stock price and a concurrent increase in return volatility the increment of total value at the vesting date acts as a proxy for the incentive effects of esos if the option is attached to the existing contract without adjusting cash compensation we suggest that a firm should not always fix the strike price to the grant date stock price instead the strike price should vary with the length of the vesting period we also show that compared with at the money options restricted stock generates greater incentives to increase stock prices in some scenarios especially when equity based awards are vested early if the vesting period is long the firm could grant options instead of restricted stock to maximize incentives

taxation and executive compensation evidence from stock options abstract understanding the effects of taxes on executive compensation provides insight into the process determining this compensation and is a key input to top income tax rate policy a 2010 tax reform in canada which greatly increased the effective tax rate on stock option compensation for a subset of firms provides a natural experiment with which to address this issue difference in differences estimates suggest that this tax increase resulted in an immediate reduction in both stock option grants and the fraction of total compensation made up of stock options with limited if any substitution towards other components of compensation

prospect theory liquidation and the disposition effect there is a well known intuition linking prospect theory with the disposition effect the tendency of investors to sell assets that have risen in value rather than fallen recently several authors have studied rigorous models in an attempt to formalize the intuition however some have found it difficult to predict a disposition effect while others produce a more extreme prediction where investors never voluntarily sell at a loss we solve a model of asset liquidation where investors realize utility over gains and losses and utility is concave over gains and convex over losses under the preferences of tversky and kahneman tversky a d kahneman 1992 advances in prospect theory cumulative representation of uncertainty j risk uncertainty5 4 297 323 and lognormal asset prices investors exhibit a disposition effect as gains are realized at a greater rate than losses nonetheless in contrast to the extant literature we find that the investor will give up and sell at a loss when the asset has a sufficiently low sharpe ratio this paper was accepted by brad barber teck ho and terrance odean special issue editors

the impact of collateralization on swap rates interest rate swap pricing theory traditionally views swaps as a portfolio of forward contracts with net swap payments discounted at libor rates in practice the use of marking to market and collateralization questions this view as they introduce intermediate cash flows and alter credit characteristics we provide a swap valuation theory under marking to market and costly collateral and examine the theory s empirical implications we find evidence consistent with costly collateral using two different approaches the first uses single factor models and eurodollar futures prices and the second uses a formal term structure model and treasury swap data the traditional approach to interest rate swap valuation sundaresan 1991a and duffie and singleton 1997 treats a swap as a portfolio of forward contracts on the underlying floating interest rate under specific assumptions regarding the nature of default and the credit risk of the counterparties duffie and singleton 1997 prove that swap rates are par bond rates of an issuer who remains at libor quality throughout the life of the contract this result is extremely useful for extracting zero coupon bond prices pricing swap derivatives and testing spot rate models despite the popularity of the traditional view market practice brings into question some of the underlying assumptions of this approach as the swap market rapidly grew in the late 1980s and early 1990s an increasingly diverse group of counterparties entered the market to mitigate their exposure to counterparty credit risk market participants began using a number of credit enhancements to improve the credit quality of swap contracts without question the most important credit enhancement is the posting of collateral in the amount of the current mark to market value of the swap contract isda 1999 due to these credit enhancements market participants commonly view interest rate swaps as free of counterparty default risk see e g tuckman 2002 this implies that in contrast to the traditional approach swap rates should be discounted not at default risky libor rates but rather at default free rates johannes and sundaresan are with the columbia business school we thank seminar partici

loss aversion in a consumption savings model abstract we propose a model of consumption and saving based on kahneman and tversky s prospect theory that implies a fundamental asymmetry in consumption behavior inconsistent with other models of consumption when there is sufficient income uncertainty a person resists lowering consumption in response to bad news about future income this resistance is greater than the resistance to increasing consumption in response to good news we present empirical evidence from five countries that confirms this behavior

risks of latin america sovereign debts before and after the financial crisis we investigate the financial determinants of the return and volatility of sovereign cds spread from six major latin american countries before and after the bankruptcy of lehman brothers other than cboe vix index we also find that global factors including us baa aaa default yield ted spread and us treasury rate all contribute to the changes in these sovereign cds spread although global risk aversion vix is a significant determinant of sovereign debt spread in the years after the crisis the emphasis has shifted towards short term refinancing risk ted furthermore the risk of greek sovereign debt crisis also transmitted latin american cds spreads immediately but only in the post lehman sub period these findings provide implications for international bonds and credit derivatives trading strategies

executive option exercises and financial misreporting abstract several recent papers document that the magnitude of potential gains from stock based compensation is positively related to the likelihood of misreporting in a sample of firms that announce restatements of their financial statements from 1997 to 2002 we examine whether managers realize these potential gains occurring from their accounting choices after controlling for diversification needs and stock price impact we find no significant evidence of higher option exercises by executives in the misreported years however for firms that are more likely to have made deliberate aggressive accounting choices we find significant evidence of higher option exercises for these firms option exercises are higher by 20 60 in comparison to industry and size matched nonrestating firms options exercises by executives are also increasing in the magnitude of the restatement as captured by the effect of the restatement on net income these higher option exercises tend to be more pervasive and are not just confined to the ceo and cfo of the firm

the timing of 52 week high price and momentum abstract we propose a new momentum strategy based on the timing of a stock s 52 week high price we find that the stocks that attained the 52 week high price in the recent past significantly outperform the stocks that attained the 52 week high price in the distant past in particular the top 10 of the stocks with the most recent 52 week high price outperform the bottom 10 of the stocks with most distant 52 week high price by 0 70 per month further conditioning on the recency of 52 week high price significantly increases the profitability of momentum strategy based on the nearness of current price to the 52 week high price specifically the average monthly return of this strategy is about twice as large for stocks with recent 52 week high price as compared with stocks with distant 52 week high price

a joint analysis of market indexes in credit default swap volatility and stock markets abstractthis paper analyses the joint dynamics of the cds volatility and stock markets using both var and markov regime switching var models with market index data it shows that the joint behaviour of the three markets is better characterized by the markov model with two regimes corresponding to low and high volatile market conditions the relationship between changes in the market indexes under a regime is consistent with theory and persistent the information transmission process of shocks to the markets is similar for the two regimes with a more important role for cds shock and the volatility in the money market is an important determinant of regime switching the findings have practical implications particularly for hedging strategies with market indexes under different market conditions

portfolio choice and trading volume with loss averse investors this paper presents a model of portfolio choice and stock trading volume with lossaverse investors the demand function for risky assets is discontinuous and non monotonic as wealth rises beyond a threshold investors follow a generalized portfolio insurance strategy this behavior is consistent with the evidence in favor of the disposition effect in addition loss averse investors will not hold stocks unless the equity premium is quite high the elasticity of the aggregate demand curve changes substantially depending on the distribution of wealth across investors in an equilibrium setting the model generates positive correlation between trading volume and stock return volatility but suggests that this relationship should be non linear

real investment implications of employee stock option exercises this paper examines a real cost of awarding employee stock options based on the observation that managers are extremely concerned about earnings per share dilution in equity related compensation we predict and find that firms experiencing significant employee stock option eso exercises shift resources away from real investments towards the repurchase of their own stocks we further find weak evidence of a decline in subsequent firm performance as measured by return on assets for several years following the cut in discretionary investments as a result of stock option exercises though this result is sensitive to the metric used to measure performance collectively our findings indicate that eso exercises potentially impose a real cost on the firm in terms of foregone investment opportunities

forecasting volatility using long memory and comovements an application to option valuation under sfas 123r horizon matched historical volatility is commonly used to forecast future volatility for op tion valuation under the statement of financial accounting standards sfas 123r in this paper we empirically investigate the performance of using historical volatility to forecast long term stock return volatility in comparison with a number of alternative forecasting methods in analyzing forecasting errors and their impact on reported income due to option expensing we find that historical volatility is a poor forecast for long term volatility and that shrinkage adjustment toward comparable firm volatility only slightly improves its per formance forecasting performance can be improved substantially by incorporating both long memory and comovements with common market factors we also experiment with a simple mixed horizon realized volatility model and find its long term forecasting perfor mance to be more accurate than historical forecasts but less accurate than long memory forecasts

capital gains overhang with a dynamic reference point financial models incorporating a reference point such as the capital gains overhang cgo model typically assume it is fixed at the purchase price combining experimental and market data this pa

testing the term structure of interest rates using a stationary vector autoregression with regime switching abstract the expectations model of the term structure for us data on three and six month treasury bills for the period 1962 1 1987 3 is explored the analysis allows for the nonstationarity of the data and for unobserved stochastic switches of regime by estimating vars in the yield spread and the change in the three month rate which allow the time series processes to change between regimes in contrast to other results for the expectations model such as those of hamilton 1988 mankiw and miron 1986 and others we find that the data do not reject the model

the term structure of interbank risk we infer a term structure of interbank risk from spreads between rates on interest rate swaps indexed to the london interbank offered rate libor and overnight indexed swaps we develop a tractable model of interbank risk to decompose the term structure into default and non default liquidity components from august 2007 to january 2011 the fraction of total interbank risk due to default risk on average increases with maturity at short maturities the non default component is important in the first half of the sample period and is correlated with measures of funding and market liquidity the model also provides a framework for pricing hedging and risk management of interest rate swaps in the presence of significant basis risk

the 52 week high momentum strategy in international stock markets abstract we study the 52 week high momentum strategy in international stock markets proposed by george and hwang george t hwang c y 2004 the 52 week high and momentum investing journal of finance 59 2145 2176 this strategy produces profits in 18 of the 20 markets studied and the profits are significant in 10 markets the 52 week high momentum profits exist independently from the jegadeesh and titman jegadeesh n titman s 1993 returns to buying winners and selling losers implications for market efficiency journal of finance 48 65 91 individual stock and moskowitz and grinblatt moskowitz t j grinblatt m 1999 do industries explain momentum journal of finance 54 1249 1290 industry momentum strategies these profits do not show reversals in the long run we find that the 52 week high is a better predictor of future returns than macroeconomic risk factors or the acquisition price the individualism index a proxy to the level of overconfidence has no explanatory power to the variations of the 52 week high momentum profits across different markets however the profits are no longer significant in most markets once transaction costs are taken into account

identifying control motives in managerial ownership evidence from antitakeover legislation this study uses the introduction of second generation antitakeover legislation as a natural experimental setting to infer the value that managers place on the control rights conferred by stock ownership we conjecture that managers will reduce their stockholdings in the post legislation period because they can ensure their prior level of control while holding fewer risky shares using a variety of specifications we find robust evidence consistent with this revealed preference hypothesis further demonstrating the key role played by control considerations in managers stockholding decisions the reductions in ownership are concentrated in management teams with higher levels of initial ownership and in firms without poison pills

moving closer to the action examining compensation design effects on firm risk we examine the influence of ceo equity based compensation on strategic risk taking by the firm building off the behavioral agency model agency theory and prospect theory we develop arguments about when equity based compensation elements will increase or decrease executive risk propensity and in turn strategic risk taking incorporating a behavioral perspective into our models of incentive alignment provides us with new and potentially more accurate predictions about how individual elements of ceo pay will influence risk selection as well as how equity compensation interacts with cash compensation and with other factors to influence risk preferences in general this study provides evidence that ceo equity based compensation significantly influences strategic risk but that this influence is more nuanced and complex than conventional treatments of executive compensation assume in particular we find that different forms of equity based pay exhibit dissimilar influences on strategic risk and that their influence changes as their value and vesting status change second we find that cash based forms of pay moderate the incentive properties of equity based pay indicating that cash based pay may affect how executives perceive risks associated with equity pay finally we find that stock price volatility and board actions each also moderate the incentive effects of equity based pay in sum our results argue for increased recognition of a behavioral perspective on executive compensation and greater precision in how we measure and model the incentive alignment properties of ceo compensation

a markov model of heteroskedasticity risk and learning in the stock market abstract we examine a variety of models in which the variance of a portfolio s excess return depends on a state variable generated by a first order markov process a model in which the state is known to economic agents is estimated it suggests that the mean excess return moves inversely with the level of risk we then estimate a model in which agents are uncertain of the state the estimates indicate that agents are consistently surprised by high variance periods so there is a negative correlation between movements in volatility and in excess returns

portfolio choice and risk attitudes an experiment i introduction suppose an investor is faced with a decision concerning how to allocate financial resources between a risky lottery asset with a higher expected return and an asset with a fixed and guaranteed lower return is the choice of portfolio independent of preferences outside the standard neoclassical model in experiments with financial incentives we study how portfolio choice depends on three well documented behavioral phenomena ambiguity aversion the illusion of control and myopic loss aversion we also investigate whether participants are willing to explicitly pay a small sum of money to indulge such preferences pay for more perceived control less ambiguity or more frequent opportunities to change the portfolio based on feedback about its performance while standard finance theory presumes that investors successfully identify and process information relevant to reaching optimal decisions in recent years a body of empirical evidence suggests that there are systematic departures from this behavior behavioral finance is concerned with psychological influences in financial decision making and markets investors make decisions while trying to stay afloat in a sea of uncertainty when predictability is low people may be prone to unjustified beliefs that may survive and even flourish in such an environment 1 people may resort to rules of thumb on a conscious or subconscious level to the extent that psychological influences are present it is economically important to consider which of these actually affect risk attitudes and portfolio choice a key issue is whether any such influences disappear when monetary incentives are present we pursue a systematic experimental comparison of three of the most prominent behavioral phenomena documented in the literature the illusion of control langer 1975 is concerned with greater confidence in one s predictive ability or in a favorable outcome when one has a higher degree of personal involvement even when one s involvement is not actually relevant ambiguity aversion ellsberg 1961 is the desire to avoid unclear circumstances even when this will not increase the expected utility myopic loss aversion benartzi and thaler 1995 combines loss aversion kahneman and tversky 1979 tversky and kahneman 1992 and a tendency to evaluate outcomes frequently this combination leads investors to be more willing to invest a greater proportion of their portfolio in risky assets if they evaluate their investments less frequently we show that these phenomena are present with monetary incentives and also investigate whether people are willing to pay money to accommodate such preferences or whether they are closer to the rational model when incentives are present with the procedure we chose the willingness to actually pa for such preferences depends on the preference the great majority of investors pay for less ambiguity or more frequent feedback investment opportunities but fewer than 10 pay to roll a determinative die themselves 2 we then examine how the preferences between lotteries in the different treatments affect portfolio choice we have participants allocate their investment capital between an asset with a sure return and a risky asset with a higher expected rate of return in fact there is very little variation in investment behavior across any of the illusion of control or ambiguity aversion treatments in contrast the results found in previous experimental studies of myopic loss aversion suggest that participants invest less in their preferred option the main conclusion we draw from these findings is that the relation between which procedure or lottery people prefer and how much they are willing to actually invest in this lottery is not trivial at all people are generally unwilling to pay even small amounts of money to indulge the illusion of control and it does not influence their portfolio choice people are generally willing to pay money for less ambiguity but having less ambiguity does not influence their portfolio choice finally in some cases people are willing to pay money for more frequent feedback and opportunities to change their portfolio but again previous studies have shown that people invest less with this additional information and greater flexibility

loss aversion in aggregate macroeconomic time series abstract prospect theory has been the focus of increasing attention in many fields of economics however it has scarcely been addressed in macroeconomic growth models neither on theoretical nor on empirical grounds in this paper we use prospect theory in a stochastic optimal growth model thereafter the focus lies on linking the euler equation obtained from a prospect theory growth model of this kind to real macroeconomic data we will use generalized method of moments gmm estimation to test the implications of such a non linear prospect utility euler equation our results indicate that loss aversion can be traced in aggregate macroeconomic time series

modelling the dependence structures of australian itraxx cds index in contrast to market expectations the correlation between credit default swap cds spreads and their respective stock prices in australia was found to be positive the global financial crisis gfc affected the nonlinear association between the two asset classes with firms experiencing financial distress and stock prices plummeting cdss issuers reacted to such exogenous shocks by increasing their risk premiums on their spreads reflecting the increased inherent risk by splitting the data into pre and post gfc contexts and by employing the use of archimedean copulas we observe a negative co movement in the post gfc period this finding is robust to several equity indices overall such result is critical for investors engaging in arbitrageur activities

professor garegnani s defence of sraffa on the material rate of profit in two articles 1973 1975 and in my economics of david ricardo 1979 i have given a blow by blow account of the evidence relating to ricardo s position on profits professor garegnani s 1982 criticisms do not lead me to retract much of his argument is based on circumstantial evidence and fails to make accurate use of what ricardo actually wrote on the matter although he is aware of the materials available the most useful path for me now is to review some of the key issues limiting myself however to an examination of the evidence presented by sraffa who originated the hypothesis which is in dispute there is no point in going further if this matter is not resolved

uncertainty avoidance and the timing of employee stock option exercise we examine the impact of the cultural norm of uncertainty avoidance on employee stock option eso exercise behavior using proprietary data from a multinational firm we find that employees from countries with higher levels of uncertainty avoidance exercise their stock options earlier these findings lend support to a maintained assumption in the eso literature that employee attitudes toward uncertainty influence stock option exercise behaviors our findings further help to explain prior findings of cross cultural differences in firms compensation practices by indicating that employee responses to option based pay and firms consequent financial reporting costs vary as functions of employee uncertainty avoidance

employee stock option exercises an empirical analysis this paper describes the exercise behavior of over 50 000 employees who hold longterm options on employer stock at eight corporations employees typically exercise options years before expiration commonly sacrificing half of the black scholes value exercise is strongly associated with recent stock price movements the market to strike ratio proximity to vesting dates time to maturity volatility and the employee s level within the company these findings have implications for compensation planners the fasb as it develops a new accounting standard for options and financial statement users and preparers who apply and interpret the new fasb standard

developments in non expected utility theory the hunt for a descriptive theory of choice under risk this article reviews recent developments in the economic theory of individual decision making under risk since the 1950s it has been known that individual choices violate the standard model of expected utility in predictable ways considerable research effort has now been devoted to the project of developing a superior descriptive model following an overview of non expected utility theories which distinguishes between conventional and non conventional approaches the paper seeks to assess these alternative models in terms of empirical success using laboratory and field data and theoretical usefulness the closing sections reflect on some new directions emerging in this literature

private information in executive stock option trades evidence of insider trading in the uk uk executives stock option exercises and associated sell decisions are motivated by private inside information executives use their inside information to lock in short term gains and to sell stock acquired prior to negative abnormal stock returns this informed trading is robust to the alternative factors that might motivate the exercise of executive stock options including option moneyness and value of exercise we suggest that the disparity in informed trading between us and uk executives option trades is related to important differences in the proportion of executive remuneration linked to options the regulation of options and the taxation of option gains

comparing with the average reference points and market reactions to above average earnings surprises abstract we examine whether the average earnings surprises announced yesterday affect investors responses to earnings news announced today we find that in the short window surrounding an earnings announcement the market rewards today s earnings news that is above yesterday s average earnings surprises with a premium consistent with yesterday s average becoming a reference point for investors to classify today s earnings news as a gain or a loss the price premium for an above average earnings surprise is larger when more earnings announcements are made on the same day and when investors face greater uncertainty in assessing firms performance we interpret this evidence as suggesting that investors rely more on the average as a reference point when they are more likely to be subject to cognitive constraints in processing information we also find that firms announcing above average earnings surprises exhibit a greater abnormal trading volume consistent with the notion that beating reference points prompts investors to trade

probability weighting and employee stock options this paper documents that riskier firms with higher idiosyncratic volatility grant more stock options to nonexecutive employees standard models in the literature cannot easily explain this pattern a model in which a risk neutral firm and an employee with prospect theory preferences bargain over the employee s pay package can the key feature which makes stock options attractive is probability weighting the model fits the data on option grants well when calibrated using standard parameters from the experimental literature the results are the first evidence that risky firms can profitably use stock options to cater to an employee demand for long shot bets

prospect theory and liquidation decisions we solve a liquidation problem for an agent with preferences consistent with the prospect theory of kahneman and tversky econometrica 47 1979 263 291 we find that the agent is willing to hold a risky project with a relatively inferior sharpe ratio if the project is currently making losses and intends to liquidate it when it breaks even on the other hand the agent may liquidate a project with a relatively superior sharpe ratio if its current profits rise or drop to the break even point our results capture the spirit of the disposition effect and the break even effect documented in empirical and experimental studies

ricardo s early treatment of profitability reply to hollander and prendergast i will deal first with professor hollander s objection to my reading of ricardo s letter to malthus of i i august i8i4 and with his startling claim to have readily accept ed the corn calculation in ricardo s correspondence of i8i4 i986 p iq99 the passage from the letter in question begins individuals do not estimate their profits by the material production but nations invariably do works vi p i2i in my article i984 p 737 i took this as a response to malthus s point that in no case of production is the produce exactly of the same nature as the capital advanced consequently we can never properly refer to a material rate of produce works vi p i i 7 the salient features of ricardo s reply are first that he does not mention let alone defend the assumption of capital product homogeneity which casts doubt on sraffa s interpretation works i p xxxi and secondly that he does defend the measurement of profits the net social surplus in material terms hollander complains that the passage from ricardo in fact says nothing about the profit rate or profit share i986 p 4 his emphasis this is true and instead of drawing the inference that any previous reference by ricardo to a material rate of produce was based on the representation of the profit share in physical terms i984 p 737 emphasis added i should have said simply profit or net surplus this does not make a fundamental difference to my interpretation hollander also underlines my observation that ricardo did not restrict the material estimation of profits to the agricultural sector but ricardo s argument that nations invariably estimate profit in material terms can be read as a justification for using the technique in a more unusual context specifically in the treatment of agriculture which was after all the sector to which malthus was apparently referring when he made his objection about the material rate of produce works vi pp i i 7 8 i therefore stand by my interpretation or tortuous meandering as professor hollander so colourfully describes it i986 p i093 which brings me to the readily accept ed corn calculation that hollander would put in its place until hollander i983 the textual basis for attributing the calculation was confined to ricardo s letter of 25 july i 8 i 4 works vi pp i i 4 5 leaving aside temporarily the validity of this evidence it is relevant to consider hollander s reaction s to his discovery in hollander i973 the calculation is described as a rather casual and

cross hedging strategies between cds spreads and option volatility during crises abstract this paper presents a joint analysis of the term structure of credit default swap cds spreads and the implied volatility surface for five european countries from 2007 to 2012 a sample period covering both the global financial crisis gfc and the european debt crisis we analyze to which extent effective cross hedges can be performed between the credit and equity derivatives markets during these two crises we find that during a global crisis a breakdown of the relationship between credit risk and equity volatility may occur jeopardizing any cross hedging strategy which happened during the gfc this stands in sharp contrast to the more localized european debt crisis during which this fundamental relationship was preserved despite turbulent market conditions for both the cds and volatility markets

discussion of information distribution within firms evidence from stock option exercises abstract huddart and lang j accounting econom 34 2003 documents that higher level of employee option exercise during a particular month is associated with lower returns in subsequent months suggesting employees exploit private information in their exercise decisions while the paper extends the insider trading literature that has focused on top executives a number of inconsistencies with prior studies remain unresolved moreover the study does not establish a direct link to the private information employees supposedly exploit establishing such a link is warranted here in the light of the surprising finding that exercises by senior employees are no more informative than those by lower rank employees

an index of loss aversion to a considerable extent risk aversion as it is commonly observed is caused by loss aversion several indexes of loss aversion have been proposed in the literature the one proposed in this paper leads to a clear decomposition of risk attitude into three distinct components basic utility probability weighting and loss aversion the index is independent of the unit of payment the main theorem shows how the indexes of different decision makers can be compared through observed choices

mean reversion in equilibrium asset prices this paper demonstrates that negative serial correlation in long horizon stock returns is consistent with an equilibrium model of asset pricing when investors display only a moderate desire to smooth their consumption commonly used measures of mean reversion in stock prices calculated from historical returns data nearly always lie within a 60 percent confidence interval of the median of the monte carlo distributions implied by the authors equilibrium model from this evidence the authors conclude that the degree of serial correlation in the data could plausibly have been generated by their model copyright 1990 by american economic association

the disposition effect in securities trading an experimental analysis the disposition effect is the tendency to sell assets that have gained value winners and keep assets that have lost value losers disposition effects can be explained by the two features of prospect theory the idea that people value gains and losses relative to a reference point the initial purchase price of shares and the tendency to seek risk when faced with possible losses and avoid risk when a certain gain is possible our experiments were designed to see if subjects would exhibit disposition effects subjects bought and sold shares in six risky assets asset prices fluctuated in each period contrary to bayesian optimization subjects did tend to sell winners and keep losers when the shares were automatically sold after each period the disposition effect was greatly reduced

the risk preferences of u s executives in this paper i elicit risk attitudes of u s executives by calibrating a subjective option valuation model for option exercising data 1996 to 2008 yielding approximately 65 000 values of relative risk aversion rra for almost 7 000 executives the observed behavior is generally consistent with moderate risk aversion and a median mean rra close to one three values are validated for chief executive officers ceos by testing theory based predictions on the influence of individual characteristics on risk preferences such as gender marital status religiosity and intelligence senior managers such as ceos presidents and chairpersons of the boards of directors are significantly less risk averse than non senior executives rra heterogeneity is strongly correlated with sector membership and firm level variables such as size performance and capital structure alternative factors influencing option exercises are tested for their influence on rra values this paper was accepted by brad barber finance

prior consequences and subsequent risk taking new field evidence from the taiwan futures exchange we use a data set from market participants in the taiwan stock exchange capitalization weighted stock index options markets to demonstrate a strong positive relationship between prior trading outcomes and subsequent risk taking in particular investors in this market take above average risks in afternoon trading after morning gains the phenomenon is prevalent in all three types of market makers accounts and across different types of market participants our findings are consistent with the argument that prior outcomes affect subsequent risk taking through a relationship that is sensitive to the model parameters i e expected return trading period and curvature of the value function because prospect theory can predict both increased and decreased levels of subsequent risk taking we provide possible explanations behind the phenomenon and discuss reasons for the variety of findings in the existing literature

loss aversion under prospect theory a parameter free measurement agrowing body of qualitative evidence shows that loss aversion a phenomenon formalized in prospect theory can explain a variety of field and experimental data quantifications of loss aversion are however hindered by the absence of a general preference based method to elicit the utility for gains and losses simultaneously this paper proposes such a method and uses it to measure loss aversion in an experimental study without making any parametric assumptions thus it is the first to obtain a parameter free elicitation of prospect theory s utility function on the whole domain our method also provides an efficient way to elicit utility midpoints which are important in axiomatizations of utility several definitions of loss aversion have been put forward in the literature according to most definitions we find strong evidence of loss aversion at both the aggregate and the individual level the degree of loss aversion varies with the definition used which underlines the need for a commonly accepted definition of loss aversion