robust stochastic discount factors when the market is incomplete a new non redundant derivative security cannot be priced by no arbitrage arguments alone moreover there will be a multiplicity of stochastic discount factors and each of them may give a different price for the new derivative security this paper develops an approach to the selection of a stochastic discount factor for pricing a new derivative security the approach is based on the idea that the price of a derivative security should not vary too much when the payoff of the primitive security is slightly perturbed i e the price of the derivative should be robust to model misspecification the paper develops two metrics of robustness the first is based on robustness in expectation the second is based on robustness in probability and draws on tools from the theory of large deviations we show that in a stochastic volatility model the two metrics yield analytically tractable bounds for the derivative price as the underlying stochastic volatility model is perturbed the bounds can be readily used for numerical examination of the sensitivity of the price of the derivative to model misspecification

delta hedging strategies comparison abstract in this paper we implement dynamic delta hedging strategies based on several option pricing models we analyze different subordinated option pricing models and we examine delta hedging costs using ex post daily prices of s p 500 furthermore we compare the performance of each subordinated model with the black scholes model

tax adjusted discount rates this paper develops models for discount rates that are adjusted for the interest tax shields of an infra marginal firm in a general tax equilibrium where there is cross sectional variation in corporate tax rates under the assumption that the firm optimally maintains a predetermined debt ratio a tax adjusted riskless discount rate model is given for valuing certainty equivalents and a tax and risk adjusted discount rate model is given for valuing expected cash flows for the latter case the asset equity debt and tax shield betas are derived and a weighted average cost of capital interpretation is given the tax adjusted capm apt security market lines for expected returns in stock and bond markets both have the same slope but different intercepts a formula is also provided for the present value of the interest tax shield when the firm optimally maintains a predetermined debt level the analysis here also differs from the existing literature in the following respects it allows for cross sectional variation in corporate tax rates and personal tax rates it shows that the market values of risky and riskless interest tax shields differ only to the extent that tax laws provide for nonlinear taxation of gains and losses it also shows that interest tax shields should be discounted at a tax adjusted discount rate that reflects the fact that they accrue to equity investors rather than debt investors continuous time simplifications of the formulas in this paper and the previous literature are also given

dynamic investment and financing under personal taxation this paper examines the effects of capital gains taxation on firms investment and financing decisions we develop a real options model in which the timing of investment the decision to default and the firm s capital structure are endogenously and jointly determined our analysis demonstrates that the asymmetric taxation of capital gains and losses fosters investment by eroding the option value of waiting it also shows that firms controlled by taxable investors employ more equity financing the higher the firm s stock price and the worse the firm s historical performance using a large sample of u s industrial firms that are owned by taxable investors between 1970 and 2008 we present new evidence on corporate investment and financing policies which is supportive of the model s predictions

litigation risk and ipo underpricing abstract we examine the relation between risk and ipo underpricing and test two aspects of the litigation risk hypothesis 1 firms with higher litigation risk underprice their ipos by a greater amount as a form of insurance insurance effect and 2 higher underpricing lowers expected litigation costs deterrence effect to adjust for the endogeneity bias in previous studies we use a simultaneous equation framework evidence provides support for both aspects of the litigation risk hypothesis

a generalized armington trade model respecification abstract even if the original version of the armington model is simple and plausible in estimation the single ces and homotheticity assumptions are too restrictive for practical application and give biased price elasticities this paper develops a generalized armington model which relaxes the single ces and homotheticity restrictions and includes the armington model as a special case the armington and generalized armington trade models are applied to the japanese meat import demand to demonstrate their performance the empirical results rejected the two assumptions imposed on the armington model the generalized armington model provides an alternative to the restrictive but indispensable armington model

european community enlargement impact on u s corn and soybean exports this paper utilizes the framework of an armington model to analyze the impact of the european community enlargement on u s corn and soybean exports results indicate that the enlargement has a significant and negative impact on u s corn exports to the new ec members increases in u s soybean exports are much smaller in volume terms declines in u s corn export prices outweigh the insignificant increases in u s soybean export prices and therefore accentuate u s losses however the u s ec agreement on their enlargement dispute cut net losses of u s corn and soybean exports to spain and portugal by about a third

on arbitrage free pricing of interest rate contingent claims unlike most interest rate claim models the ho lee model utilizes full information on the current term structure unfortunately the model has a major deficiency in that negative interest rates can occur this article modifies the model such that interest rates are well behaved

term structure of interest rates and implied market frictions the min max approach it is often assumed that financial markets are frictionless bond markets are illiquid and bond prices are observed with errors the magnitude of these errors leads to violation of no arbitrage conditions and consequently prevents researchers from obtaining an estimate of the term structure ts of interest rates researchers have had to settle for a second best estimate of the ts e g obtained via regression at a cost of an economically unrealistic assumption of symmetric market frictions the true shape of market frictions however is not known and generally is a highly complex issue a no arbitrage based methodology that avoids making detrimental assumptions is developed here it facilitates empirical investigation of the shape of the market frictions and of the ts that are simultaneously imputed from market data assuming efficient market frictions that minimize the maximum net arbitrage the empirical investigation performed in the canadian and u s markets shows that in both markets the frictions are asymmetric and the estimates of the ts produced via regression and our methodology significantly differ

a dynamic programming approach for pricing options embedded in bonds abstract we propose a dynamic programming dp approach for pricing options embedded in bonds the focus being on call and put options with advance notice an efficient procedure is developed for the cases where the interest rate process follows the vasicek cox ingersoll ross cir or generalized vasicek models our dp methodology uses the exact joint distribution of the interest rate and integrated interest rate at a future date conditional on the current value of the interest rate we provide numerical illustrations for the vasicek and cir models comparing our dp method with finite difference methods our procedure compares quite favorably in terms of both efficiency and accuracy an important advantage of the our dp approach is that it can be applied to more general models calibrated to capture the term structure of interest rates e g the generalized vasicek model

valuing managerial flexibility an application of real option theory to mining investments abstract the value of managerial flexibility is assessed using data on prices costs grades reserves ore extraction and metal output for a panel of canadian copper mines a real option model is estimated and solved for project and option values most empirical researchers i consider the initial investment decision but neglect flexible operation thereafter ii assume that price is stochastic but ignore cost and reserve uncertainty and iii model price as a nonstationary stochastic process the evolution of three state variables price cost and reserves is assessed here differences in assumptions compared to others are found to lead to large differences in estimated project and option values

a theory of credibility this paper presents models in which one agent must decide whether to trust another whose motives are uncertain reliability can only be communicated through actions in this context it pays for people to build a reputation based on reliable behaviour someone becomes credible by consistently providing accurate and valuable information or by performing useful services the theory provides a justification for long term arrangements without binding contracts it also describes those situations where it pays an agent to cash in on his reputation many decisions depend on trusting someone consumers must decide whether to believe advertisements banks need to judge the reliability of loan applicants and employers must decide how much responsibility to delegate to their employees this paper attempts to model situations that arise when someone is uncertain about whether to trust the people he deals with in this context reputations for reliability are valuable an agent becomes credible by consistently providing accurate valuable information or by always acting responsibly i analyse a series of simple abstract models of information transmission in the basic model there are two agents the sender s and the receiver r who are to play the game a known finite number of times at each stage both players learn the value of a parameter measuring the importance of that period s play of the game that is the value of making a correct decision and s obtains payoff relevant information s then sends a signal to r who makes a decision that affects the welfare of both players after both players learn the consequences of r s decision the process repeats at each stage r must decide what action to take in order to do that he must assess the credibility of s the difficulty arises because r is uncertain about s s preferences when play begins i model this by assuming that with positive probability s has identical preferences to r s is a friend and with positive probability s has completely opposed preferences to r s is an enemy this uncertainty creates a trade off for enemy senders at each stage providing honest information enhances s s reputation but only at the expense of foregoing an opportunity for immediate gain by duping r the possibility that s is a friend lends credibility to what he says but this credibility may also be exploited by an enemy s the principal equilibrium has the following form in the basic model where s has no control over the importance of a given play s typically conveys accurate information for the first several periods r raises the probability he places on s being friendly after receiving accurate information if he believes that an enemy would have lied to him with positive probability the more important the information the more likely an enemy will attempt to deceive r an enemy will eventually take advantage of r by misleading him when this happens the sender loses all opportunities for deception in the future i

the capital gain lock in effect and perfect substitutes abstract this paper analyses the effect of investors accrued capital gains on optimal portfolio composition and equilibrium returns under the assumption that investors are able to re balance with perfect substitute securities no dominance arguments are used to show that pricing differences because of accrued capital gains do not arise among securities which are perfect substitutes these arguments are insufficient however to prevent pricing differences because of accrued capital gains among securities which are not perfect substitutes trading rules are developed which outline the conditions necessary for the realisation of accrued capital gains and the deferral of capital losses these trading rules also provide guidance on which securities investors should sell given their tax basis when re balancing their portfolios

risk returns and values in the presence of differential taxation abstract we show that there exist separate security market lines smls for debt and equity securities in an equilibrium with differential taxation of debt and equity we characterize the conditions under which these smls have the same price of risk with different intercepts and the conditions under which the tax effect of leverage is linear in debt value as in the adjusted present value method we explore the implications of our results for cost of capital calculations how to calculate the cost of capital for debt and equity and how to unlever betas correctly accounting for differential taxation

optimal security design how should new securities be designed traditional theories have little to say on this the literature on capital structure and general equilibrium theories with incomplete markets take the securities firms issue as exogenous this paper explicitly incorporates the transaction costs of issuing securities and develops a model where the instruments that are traded are chosen optimally and the economy s market structure is endogenous among other things it is shown that the firm s income stream should be split so that in every state all payoffs are allocated to the security held by the group that values them most this abstract was borrowed from another version of this item

european community enlargement and world trade in fruits and vegetables world trade models for the product classes fresh fruits dried fruits processed fruits fresh vegetables and processed vegetables are estimated and used to project the impact on export prices and trade patterns likely to arise after the european economic community enlargement with greece portugal and spain the results indicate that current world trends in import demands and export supplies if continued and in the absence of enlargement will cause marked declines of export prices for four of the above product categories except dried fruits the enlargement will not significantly modify these price projections but it will divert a significant part of european community imports of these products to the three new member countries on 1 january 1981 greece became the tenth country to join the european community ec spain and portugal have also applied for full ec membership and negotiations are underway with an anticipated date of both spanish and portuguese accession of 1986 agriculture has loomed large in the enlargement negotiations with spain greece and portugal sgp given that the national product in these three countries depends much more on agriculture than in the average country of the former ec nine within agriculture

taxable and tax deferred investing a tax arbitrage approach we analyze an intertemporal portfolio problem with both taxable and tax deferred retirement accounts using a tax arbitrage argument we identify conditions under which the optimal location decision where to place an asset is separable from the allocation decision how much to allocate to each asset investors place highly taxed assets in the tax deferred account to maximize the tax benefit and adjust their taxable portfolios to achieve the optimal risk exposure we show that the two account problem can be reduced to a taxable account only problem the results are robust to capital gains tax deferrals consumption and contribution decisions and stochastic tax rates

media legitimation effects in the market for initial public offerings in this study we argue that media provided information affects investors impressions of newly public firms in 225 initial public offerings ipos the volume of mediaprovided information had a negative diminishing relationship with underpricing and a positive diminishing relationship with stock turnover on the first day of trading the relationship between the tenor of media provided information and underpricing increases at a nonlinear rate and decreases similarly for turnover findings provide important evidence that publicly available information not only reflects ipos legitimacy but also adds to their legitimacy and influences investor behavior in the last 20 years an increasing amount of research on markets has been conducted from a social constructionist perspective emphasizing how social structures enhance the flow of useful and credible information that market participants use to reduce the uncertainty of market exchanges e g aldrich fiol 1994 zuckerman 1999 further recent organizational research has begun to stress the influence of information intermediaries such as financial analysts and the media on mar

organizational debut on the public stage marketing myopia and initial public offerings successful initial public offerings ipos provide firms with access to valuable resources but also put pressure on firms to impress potential investors with evidence of their current well being and prospects for future growth to impress investors ipo firms might curtail their marketing budgets which appears to inflate current earnings and provide evidence of current well being however curtailing marketing budgets unexpectedly during an ipo may be a myopic practice in that the immediate benefits of these budget cuts are offset by their longer term adverse consequences on financial well being the extent of these adverse consequences in turn may be moderated by external firm factors including strategic alliances and key customer relationships and internal firm factors such as the strategic emphasis on value creation versus value appropriation a sample of 1 095 ipos during 2000 2011 reveals evidence of myopic marketing practices in more than 37 of the sample investors seem misled during ipos bu

using tucker s theorem of the alternative to simplify review and expand discrete arbitrage theory abstract for valuing derivatives and other assets in securities and commodities markets arbitrage pricing theory has been a major approach for decades this paper derives fundamental arbitrage pricing results in finite dimensions in a simple unified framework using tucker s theorem of the alternative frictionless results that is perfect market results plus imperfect market results such as those with dividends periodic interest payments transaction costs different interest rates for lending and borrowing shorting costs and constrained short selling are presented while the results are mostly known and appear in various places our contribution is to present them in a coherent and comprehensive fashion with very simple proofs the analysis yields a simple procedure to prove new results and some are presented for cases with imperfect market frictions

continuous time methods in finance a review and an assessment i survey and assess the development of continuous time methods in finance during the last 30 years the subperiod 1969 to 1980 saw a dizzying pace of development with seminal ideas in derivatives securities pricing term structure theory asset pricing and optimal consumption and portfolio choices during the period 1981 to 1999 the theory has been extended and modified to better explain empirical regularities in various subfields of finance this latter subperiod has seen significant progress in econometric theory computational and estimation methods to test and implement continuous time models capital market frictions and bargaining issues are being increasingly incorporated in continuous time theory the roots of modern continuous time methods in finance can be traced back to the seminal contributions of merton 1969 1971 1973b in the late 1960s and early 1970s merton 1969 pioneered the use of continuous time modeling in financial economics by formulating the intertemporal consumption and portfolio choice problem of an investor in a stochastic dynamic programming setting merton 1973b also showed how such a framework can be used to develop equilibrium asset pricing implications thereby significantly extending the asset pricing theory to richer dynamic settings and expanding the scope of applications of continuous time methods to study problems in financial economics 1 within a span of about 30 years from the publication of merton s inf luential papers continuous time methods have become an integral part of financial economics indeed in certain core areas in finance such as e g asset pricing derivatives valuation term structure theory and portfolio selection continuoustime methods have proved to be the most attractive way to conduct research and gain economic intuition the continuous time approach in these areas has produced models with a rich variety of testable implications the econometric theory for testing continuous time models has made rapid strides in the last decade and has thus kept pace with the impressive progress on the theoretical front one hopes that the actual empirical investigations and estimation using the new procedures will follow suit soon

an intertemporal general equilibrium model of asset prices this paper develops a continuous time general equilibrium model of a simple but complete economy and uses it to examine the behavior of asset prices in this model asset prices and their stochastic properties are determined endogenously one principal result is a partial differential equation which asset prices must satisfy the solution of this equation gives the equilibrium price of any asset in terms of the underlying real variables in the economy in this paper we develop a general equilibrium asset pricing model for use in applied research an important feature of the model is its integration of real and financial markets among other things the model endogenously determines the stochastic process followed by the equilibrium price of any financial asset and shows how this process depends on the underlying real variables the model is fully consistent with rational expectations and maximizing behavior on the part of all agents our framework is general enough to include many of the fundamental forces affecting asset markets yet it is tractable enough to be specialized easily to produce specific testable results furthermore the model can be extended in a number of straightforward ways consequently it is well suited to a wide variety of applications for example in a companion paper cox ingersoll and ross 7 we use the model to develop a theory of the term structure of interest rates many studies have been concerned with various aspects of asset pricing under uncertainty the most relevant to our work are the important papers on intertemporal asset pricing by merton 19 and lucas 16 working in a continuous time framework merton derives a relationship among the equilibrium expected rates of return on assets he shows that when investment opportunities are changing randomly over time this relationship will include effects which have no analogue in a static one period model lucas considers an economy with homogeneous individuals and a single consumption good which is produced by a number of processes the random output of these processes is exogenously determined and perishable assets are defined as claims to all or a part of the output of a process and the equilibrium determines the asset prices our theory draws on some elements of both of these papers like merton we formulate our model in continuous time and make full use of the analytical tractability that this affords the economic structure of our model is somewhat similar to that of lucas however we include both endogenous production and

a continuous time equilibrium model of forward prices and futures prices in a multigood economy abstract this paper is a theoretical investigation of equilibrium forward and futures prices we construct a rational expectations model in continuous time of a multigood identical consumer economy with constant stochastic returns to scale production using this model we find three main results first we find formulas for equilibrium forward futures discount bond commodity bond and commodity option prices second we show that a futures price is actually a forward price for the delivery of a random number of units of a good the random number is the return earned from continuous reinvestment in instantaneously riskless bonds until maturity of the futures contract third we find and interpret conditions under which normal backwardation or contango is found in forward or futures prices these conditions reflect the usefulness of forward and futures contracts as consumption hedges

arbitrage and martingales with taxation this paper extends the martingale analysis of no arbitrage pricing to worlds with taxation the absence of arbitrage is shown to imply the existence of different shadow prices for income streams that are subject to differing tax treatments for example no arbitrage implies the existence of different martingale measures for capita l gains and for ordinary income when they are differentially taxed andfor item s such as depreciation expenses that influence only after tax cash flows the analysis is applied to several topics in finance including the debt equity decision tax options and the taxation of dividends and pensions copyright 1987 by university of chicago press

term structure multiplicity and clientele in markets with transactions costs and taxes the authors investigate term structure with realistic transactions costs and taxes its properties are derived from a certain no arbitrage condition via duality theory in convex programming transactions costs imply an infinite multiplicity of term structures a simple example with realistic transactions costs shows that this multiplicity can induce a valuation range of over 277 basis points transactions costs also allow equilibrium without short sale restrictions the authors find the minimum transactions costs that prevent arbitrage in addition the exact conditions for weak clientele in which investors will not buy some bonds and may not sell any that they already hold are established most research on the pricing of riskless bonds hereafter bonds uses a noarbitrage model equilibrium pricing is based on the assumption that there is no buy and hold investment strategy that provides riskless arbitrage profit however most of these studies ignore transactions costs 2 the clientele model hereafter ss developed by stephen schaefer 19 adopts a no arbitrage assumption na equivalent to the existence of a valuation operator this operator is a vector of discount factors known as the term structure ss shows that na implies the existence of a tax bracket specific term structure that ensures that the bonds after tax present values do not exceed their prices ss also shows that in markets with spanning positive term structures consistent with na will not exist for some brackets see his example in subsection iva below investors in such brackets would have arbitrage opportunities to resolve this na violation and make equilibrium feasible ss assumes a prohibition on shorting this implies clientele effects in the usual sense i e investors in some brackets hold some but not all bonds there may be however a bracket in which investors hold positive amounts of all bonds this would be a

existence of equivalent martingale measures in finite dimensional securities markets abstract given the information structure and the number of securities we characterize the set of all price dividend systems for which there exist a dynamic portfolio with strictly positive value through time and a strictly positive probability q such that expressing prices and dividends in units of such portfolio every gain process is a q martingale we also weaken our characterization by showing that the existence of a trading strategy with strictly positive terminal payoffs only is generically sufficient for the existence of an equivalent martingale measure finally an example shows that our results robustely extend the current literature on the topic journal of economic literature classification numbers d52 g10 g12

testing dynamic specification for import demand models the case of cotton error correction models impose few prior restrictions on dynamic model specification and allow the data to determine model structure despite this obvious advantage few applications have adopted the error correction model to explain trade flows an error correction model of cotton import demand is estimated for france japan and hongkong a variety of tests are applied to determine the dynamic structure of the model it is found that the most general models are those that best fit the data for cotton import demand long run elasticities from these general models are significantly different than elasticities derived from a comparable static model

time horizon and the discount rate abstract we consider an economy a la lucas 1978 econometrica46 1429 1446 with a risk averse representative agent the exogenous growth rate of the economy follows a random walk we characterize the set of utility functions for which it is efficient to discount more distant cash flows at a lower rate the benchmark result is that when the growth rate is almost surely nonnegative the yield curve is decreasing if and only if relative risk aversion is decreasing with wealth relaxing the assumption on the absence of recession requires more restrictions on preferences such as increasing relative prudence journal of economic literature classification numbers d81 d91 q25 q28

using cheap talk as a test of validity in choice experiments abstract in two experiments on the choice of consumer goods the estimated marginal willingness to pay for food is found to be lower in the survey version with cheap talk our test can be seen as a test of hypothetical bias this implies that we cannot reject the hypothesis of a hypothetical bias for marginal wtp in choice experiments

stock market reactions to customer and competitor orientations the case of initial public offerings recognizing that initial public offerings ipos represent the debut of private firms on the public stage this study investigates how pre ipo customer and competitor orientations ccos affect ipo outcomes building on information economics we propose that ccos influence investors sentiments toward an ipo and that both ipo specific variables which influence the credibility of cco information and facets of the organizational institutional and task environments which influence the appropriateness of cco information moderate this influence we test the framework using data collected from computer aided text analysis expert coders and secondary sources for 543 ipos across 43 industries between 2000 and 2004 a bayesian shrinkage model which accounts for industry specific effects and uses latent instrumental variables to address cco endogeneity shows that ccos positively influence ipo outcomes furthermore 1 underwriter reputation and venture funding positively moderate the effects of ccos 2 technological and market turbulence positively and institutional complexity negatively moderate the effect of customer orientation and 3 technological turbulence competitive intensity and institutional complexity positively moderate the effect of competitor orientation also accounting for endogeneity using latent instrumental variables substantially improves the predictive validity of the model relative to alternative model specifications

nominal contracts in a bimetallic standard as its central feature a bimetallic standard grants nominal debtors an option to deliver either of two metals with results from the option pricing literature construction of a formula to evaluate the bimetallic option in debt instruments is straightforward with this formula one can compute the option value in a wide range of nineteenth century u s treasury securities posession of the option values permits an adjustment of the yields on u s securities to make them comparable to yields on nonmetallic european securities evaluating the option allows the estimation of transfers from debtors to creditors copyright 1986 by american economic association

municipal debt and marginal tax rates is there a tax premium in asset prices we study the marginal tax rate incorporated into short term municipal rates using municipal swap market data using an affine model we identify the marginal tax rate and the credit liquidity spread in 1 week tax exempt rates as well as their associated risk premia the marginal tax rate averages 38 0 and is related to stock bond and commodity returns the tax risk premium is negative consistent with the strong countercyclical nature of after tax fixed income cash flows these results demonstrate that tax risk is a systematic asset pricing factor and help resolve the muni bond puzzle

incomplete preferences and equilibrium in contingent markets this paper shows that betting or speculative trading between agents with incomplete preferences is likely to occur if agents have access to convex choice sets this contrasts sharply with endowment economy models where preference incompleteness often hinders betting speculative trading or mutually beneficial insurance arrangements our results imply that decision makers with identical tastes and identical feasible sets will potentially gain from speculative trade for generic status quo allocations we also develop a framework for endogenizing the status quo allocations of decision makers that are treated exogenously in the existing literature finally we provide a tractable differential representation of status quo allocations equilibria and conditions where speculative trade may or may not emerge

endogenous supranational policy decisions the common agricultural policy of the european community the analysis of the supranational ec decisions on the cap indicates that they are endogenous and could largely be explained by past income growth and the development of budgetary expenditures prevailing at the time of the price decisions the empirical results corroborate the hypothesis that monetary compensatory amounts are integral part of common price decisions agricultural income growth could be explained by past price policy decisions whereas budget expenses are determined by u s world market prices and the exchange rate of the ecu against the u s

a note on capital asset pricing and heterogeneous taxes abstract in this paper we present a stylized model where we show how asset prices i e required expected rates of returns may be characterized in a world with heterogeneous asset taxes within a simple capm like framework we derive an after tax beta equal to the pre tax beta multiplied by a non obvious asset specific tax adjustment we further show in what sense the security market line here can be replaced by a security market fan well known capm relations are obtained as special cases and policy implications are analyzed

effects of cheap talk on consumer willingness to pay for golden rice a large body of literature suggests willingness to pay is overstated in hypothetical valuation questions as compared to when actual payment is required recently cheap talk has been proposed to eliminate the potential bias in hypothetical valuation questions cheap talk refers to process of explaining hypothetical bias to individuals prior to asking a valuation question this study explores the effect of cheap talk in a mass mail survey using a conventional value elicitation technique results indicate that cheap talk was effective at reducing willingness to pay for most survey participants however consistent with previous research cheap talk did not reduce willingness to pay for knowledgeable consumers

tax arbitrage and the existence of equilibrium prices for financial assets in models where both investors and securities are subject to differential taxation there may be no set of prices that rule out infinite gains to trade or tax arbitrage this paper characterizes the joint restrictions on financial asset returns and investors tax schedules that preclude tax arbitrage in the absence of short sale constraints the authors show that if there exists any configuration of marginal tax rates on investors tax schedules that rule out infinite gains to trade then no tax arbitrage prices will exist they also show that the existence of no tax arbitrage prices ensures the existence of equilibrium prices the effects of differential taxation on the equilibrium prices of financial assets have attracted much attention from financial economists in recent years otherwise identical securities that contribute to taxable income to different degrees will in general be valued differently by taxable investors as a result tax considerations have been useful in helping explain the effect of dividend yield on stock returns the effect of coupon levels and term to maturity on bond prices 2 the timing of investors portfolio transactions 3 and the observed capital structures of firms 4 while a rich set of observed behaviors can be better understood by reference to differential taxation there are well known difflculties in dealing with taxes in a general equilibrium setting to clear markets relative prices must reflect the marginal rates of substitution of all agents simultaneously when tax rates differ across investors however this condition can be impossible to achieve to illustrate consider a world of perfect certainty with two assets a tax exempt municipal bond and a taxable government bond to equate marginal rates of substitution the rate of return on the government bond rg must equal that on the municipal rm grossed up by one minus the investor s marginal tax rate ti that is rg rm 1 ti if there are investors in more than one tax bracket this condition will obviously be impossible to satisfy for all of them simultaneously both authors from graduate school of industrial administration carnegie mellon university we wish to thank scott richard steven spear and an anonymous referee for helping us sort through the issues considered here seminar participants at columbia wharton the johnson symposium on asset pricing at the university of wisconsin madison and the 1986 western finance association meeting also provided valuable comments we are also grateful for the financial support provided by the center for public policy research carnegie mellon university all errors are our own responsibility

single factor heath jarrow morton term structure models based on markov spot interest rate dynamics this paper considers the class of heath jarrow morton term structure models where the spot interest rate is markov and the term structure at time t is a function of time maturity and the spot interest rate at time t a representation for this class of models is derived and i show that the functional forms of the forward rate volatility structure and the initial forward rate curve cannot be arbitrarily chosen i provide necessary and sufficient conditions indicating which combinations of these functional forms are allowable i also derive a partial differential equation representation of the term structure dynamics that does not require explicit modeling of both the market price of risk and the drift term for the spot interest rate process using the analysis presented in this paper a class of intertemporal term structure models is derived

talk is cheap although friedrich a von hayek leonid hurwicz and others stressed how the price system communicates private information on preferences technology and endowments our main means of communication is surely words but it is unclear whether mere words can be trusted absent outside sanctions for lying such as perjury law or a valuable reputation for honesty talk is cheap the perspective of the standard theory of signaling seems to suggest that cheap talk should be uninformative but this is misleading cheap talk can sometimes convey information and affect real payoffrelevant actions yet cheap talk s power is limited for example even given an unlimited chance to talk rational people may not reach an equilibrium or may not escape a bad one a growing literature in game theory political science and economics which i cannot survey here studies what cheap talk can and cannot do here i merely sketch some themes

optimal contracts under costly state falsification we examine an exchange economy with two agents one risk neutral with a certain endowment and a second risk averse with a random endowment the realization of the endowment is public but can be falsified by the second agent at a cost for a broad class of falsification cost functions the optimal no falsification contract is noncontingent on a left hand interval and strictly increasing with a slope strictly less than one on a right hand interval under a mild further restriction optimal no falsification contracts are in addition piece wise linear optimal contracts may in general require falsifying the state but for a set of the highest endowment realizations there is no falsification we find simple conditions under which the optimal contract is a no falsification contract the model has applications that include financial insurance and employment contracts and tax policy

which ties matter when the contingent effects of interorganizational partnerships on ipo success this paper investigates the contingent value of interorganizational relationships at the time of a young firm s initial public offering ipo we compare the signaling value to young firms of having ties with two types of interorganizational partnerships endorsement relationships such as those with venture capital firms and investment banks and strategic alliance partnerships we propose that under different equity market conditions potential investors in an issuing firm attend to different types of uncertainty attention to these different types of uncertainty affects investors perceptions of the relative value of a young firm s different kinds of endorsements and partnerships and hence ipo success results from a sample of young biotechnology firms show that ties to prominent venture capital firms are particularly beneficial to ipo success during cold markets while ties to prominent investment banks are particularly beneficial to ipo success during hot markets a firm s strategic alliances with major pharmaceutical health care firms did not have such contingent effects implications for understanding the contingent value of interorganizational ties are discussed copyright 2003 john wiley sons ltd

non stationarity and the import demand for virgin olive oil in the european union the aim of this study is to analyse the importation of virgin olive oil to european union countries paying special attention to the spanish export contribution the method used is based on the estimation of an imports demand system the novelty of the paper lies not in the modelling approach but in the explicit consideration of the univariate characteristics of series that is included in the analysis since prices are non stationary cointegration among them has been tested results indicate that they are cointegrated and that homogeneity holds as a result relative prices are included in the imports demand system structural change is also considered so as to account for the entrance of both spain and greece into the eu during the period studied results demonstrate the leadership of spain within the eu virgin olive oil market as well as the increasing competitiveness of greek oil

whither armington trade models the armington trade model distinguishes commodities by country of origin and import demand is determined in a separable two step procedure this framework has been applied to numerous international agricultural markets with the objective of modeling import demand in addition computable general equilibrium cge models commonly employ the armington formulation in the trade linkage equations the purpose of this paper is to test the armington assumptions of homotheticity and separability with data from the international cotton and wheat markets both parametric and nonparametric tests were performed and the empirical results reject the armington assumptions this has important implications for international trade modeling and cge modeling

efficient trading strategies in the presence of market frictions we provide a price characterization of efficient contingent claims that is chosen by at least a rational agent in multiperiod economies with market frictions frictions include market incompleteness transaction costs short selling and borrowing costs we characterize the inefficiency cost of a trading strategy its required investment minus the largest amount necessary to obtain the same utility level and we propose a measure of portfolio performance we show that arbitrage bounds cannot be tightened based on efficiency without restricting preferences or endowments we observe common investment strategies becoming inefficient with market frictions and others rationalized by them in this article we characterize efficient contingent claims to future consumption consumption bundles in multiperiod economies with uncertainty taking a wide range of market frictions into account 1 such as dynamic market

put call parity and market frictions abstract we extend the fundamental theorem of finance and the pricing rule representation theorem to the case in which market frictions are taken into account but the put call parity is still assumed to hold in turn we obtain a representation of the pricing rule as a discounted expectation with respect to a nonadditive risk neutral probability

seasonal protection of f v imports in the eu impacts of the entry price system the measures of border protection applied by the european union eu to imports of fruits and vegetables fv are complex and usually not well represented in trade models not only because of the range of instruments still constraining trade but also because of product differentiation and seasonality in these products this article assesses the impact of eliminating entry price ep constraints applied to a group of fv products the proposed model is of a partial equilibrium nature and takes seasonality into account we have applied the model to imports of tomatoes cucumbers clementines and table grapes trade impacts of eliminating ep are significant for particular origins during specific seasons most notably for moroccan tomatoes the volumes and prices of products originating in the eu experience moderate reductions

moment based estimation of stochastic volatility abstract this paper makes use of the distributional information contained in high frequency data to test for the specification of the functional form of the volatility process within the class of stochastic volatility models it s calculus is implemented in order to obtain the first and second conditional moment of the driving stochastic differential equation for the volatility process these analytical expressions are augmented by their lag and lag squared and are used to form the corresponding gmm estimator the base case stochastic volatility model is extended to allow for the leverage effect and jumps in returns empirical estimation confirms the presence of fast mean reversion in volatility and jumps in returns for the 5 min s p 500 stock market index further estimation results also seem to indicate the presence of jumps in the volatility process that are correlated to the jumps in returns

valuation of risky assets in arbitrage free economies with frictions this paper derives a framework for arbitrage models in markets with frictions it generalizes the existence of a valuation operator to such markets as in perfect markets the valuation operator is a linear operator and its existence is implied by the no arbitrage condition in imperfect markets the valuation operator is individual specific and depends on the agent s position in the market the methodology employed in the paper is duality in convex programming

comparative dynamics of an equilibrium intertemporal asset pricing model this paper uses recursive competitive theory to develop a general equilibrium asset pricing model in this framework all prices and rates of return are endogenously determined thus enabling us to analyze the effects of changes in preferences technological uncertainty and expectations on the structure of security prices in particular we focus on how the market risk premium varies with changes in the underlying economic environment an issue which other asset pricing models have chosen not to address