valuation of foreign currency options some empirical tests this paper investigates the efficiency of the market for foreign currency options with the help of a modified version of the black scholes model the evidence in the ex post tests is inconsistent with this hypothesis since we find a large number of opportunities for abnormal profits a second set of tests is conducted on an ex ante basis to determine whether these profit opportunities exist even if the execution of the strategy is delayed by one day the evidence from these tests provides more support for the hypothesis of market efficiency

option pricing when the variance changes randomly theory estimation and an application in this paper we examine the pricing of european call options on stocks that have vari ance rates that change randomly we study continuous time diffusion processes for the stock return and the standard deviation parameter and we find that one must use the stock and two options to form a riskless hedge the riskless hedge does not lead to a unique option pricing function because the random standard deviation is not a traded security one must appeal to an equilibrium asset pricing model to derive a unique option pricing function in general the option price depends on the risk premium associated with the random standard deviation we find that the problem can be simplified by assuming that volatility risk can be diversified away and that changes in volatility are uncorrelated with the stock return the resulting solution is an integral ofthe black scholes formula and the distribution function for the variance of the stock price we show that accurate option prices can be computed via monte carlo simulations and we apply the model to a set of actual prices

the pricing of options on assets with stochastic volatilities one option pricing problem that has hitherto been unsolved is the pricing of a european call on an asset that has a stochastic volatility this paper examines this problem the option price is determined in series form for the case in which the stochastic volatility is independent of the stock price numerical solutions are also produced for the case in which the volatility is correlated with the stock price it is found that the black scholes price frequently overprices options and that the degree of overpricing increases with the time to maturity one option pricing problem that has hitherto remained unsolved is the pricing of a european call on a stock that has a stochastic volatility from the work of merton 12 garman 6 and cox ingersoll and ross 3 the differential equation that the option must satisfy is known the solution of this differential equation is independent of risk preferences if a the volatility is a traded asset or b the volatility is uncorrelated with aggregate consumption if either of these conditions holds the risk neutral valuation arguments of cox and ross 4 can be used in a straightfoward way this paper produces a solution in series form for the situation in which the stock price is instantaneously uncorrelated with the volatility we do not assume that the volatility is a traded asset also a constant correlation between the instantaneous rate of change of the volatility and the rate of change of aggregate consumption can be accommodated the option price is lower than the blackscholes b s 1 price when the option is close to being at the money and higher when it is deep in or deep out of the money the exercise prices for which overpricing by b s takes place are within about ten percent of the security price this is the range of exercise prices over which most option trading takes place so we may in general expect the b s price to overprice options this effect is exaggerated as the time to maturity increases one of the most surprising implications of this is that if the b s equation is used to determine the implied volatility of a near the money option the longer the time to maturity the lower the implied volatility numerical solutions for the case in which the volatility is correlated with the stock price are also examined the stochastic volatility problem has been examined by merton 13 geske 7 johnson 10 johnson and shanno 11 eisenberg 5 wiggins 16 and

central bank announcements of asset purchases and the impact on global financial and commodity markets abstract we present evidence on the effects of large scale asset purchases by the federal reserve and the bank of england since 2008 we show that announcements about these purchases led to lower long term interest rates and depreciations of the u s dollar and the british pound on announcement days while commodity prices generally declined despite this more stimulative financial environment we suggest that lsap announcements likely involved signaling effects about future growth that led investors to downgrade their u s growth forecasts lowering long term us yields depreciating the value of the u s dollar and triggering a decline in commodity prices moreover our analysis illustrates the importance of controlling for market expectations when assessing these effects we find that positive u s monetary surprises led to declines in commodity prices even as long term interest rates fell and the u s dollar depreciated in contrast on days of negative u s monetary surprises i e when markets evidently believed that monetary policy was less stimulatory than expected long term yields the value of the dollar and commodity prices all tended to increase

competition risk and managerial incentives this paper examines how the degree of competition among firms in an industry affects the optimal incentives that firms provide to their managers a central assumption is that there is free entry and exit in the industry which implies that changes in the nature of competition lead to changes in the equilibrium market structure the main result is that as the intensity of product market competition increases as a result of greater product substitutability or greater market size principals unambiguously provide stronger incentives to their agents to reduce costs at the same time more intense competition also leads to more volatile firm level profits consequently managers incentives are positively correlated with firm level risk consistent with empirical evidence a decrease in the cost of entering the market has the opposite effect on incentives but still induces a positive correlation between risk and incentives

the volatility risk premium embedded in currency options this study employs a non parametric approach to investigate the volatility risk premium in the over the counter currency option market using a large database of daily delta neutral straddle quotes in four major currencies the british pound the euro the japanese yen and the swiss franc we find that volatility risk is priced in all four currencies across different option maturities we find that the volatility risk premium is negative with the premium decreasing in maturity finally we also find evidence that jump risk may be priced in the currency option market

efficiency tests of the foreign currency options market based on a new options transactions data base from the philadelphia stock exchange foreign currency options market this paper examines the importance of the effect of nonsynchronous prices and transaction costs on the usual option market efficiency tests the tests conducted are based on the transaction cost adjusted early exercise and put call parity pricing boundaries applicable to the american foreign currency options market the test results show that the put call parity boundary tests are sensitive to both nonsynchronous prices and transaction costs the early exercise boundary tests are sensitive to transaction costs but are not very sensitive to simultaneity of the option price and the underlying spot price under the no transaction costs scenario a large number of early exercise boundary violations is found even when simultaneous spot and option prices are used these violations disappear when actual transaction costs are taken into account

reading the smile the message conveyed by methods which infer risk neutral densities abstract in this study we compare the quality and information content of risk neutral densities obtained by various methods we consider a non parametric method based on a mixture of log normal densities the semi parametric ones based on an hermite approximation or based on an edgeworth expansion the parametric approach of malz which assumes a jump diffusion for the underlying process and heston s approach assuming a stochastic volatility model we apply those models on ff dm exchange rate options for two dates models differ when important news hits the market here anticipated elections the non parametric model provides a good fit to options prices but is unable to provide as much information about market participants expectations than the jump diffusion model

accelerated gaussian importance sampler with application to dynamic latent variable models summary we propose a new generic and highly efficient accelerated gaussian importance sampler agis for the numerical evaluation of very high dimensional density functions a specific case of interest to us is the evaluation of likelihood functions for a broad class of dynamic latent variable models the feasibility of our method is strikingly illustrated by means of an application to a first order dynamic stochastic volatility model for daily stock returns whose likelihood for an actual sample of size 2022 is evaluated with high numerical accuracy by means of 10 000 monte carlo replications the estimated model parsimoniously dominates arch and garch alternatives one of which includes twelve lags

systematic jump risks in a small open economy simultaneous equilibrium valuation of options on the market portfolio and the exchange rate abstract the valuation of stock options and currency options has witnessed an explosion of new development in the past 20 years these models set up either in a partial equilibrium or a general equilibrium framework have certainly enriched our understanding of option valuation in one way or the other however the main drawback of these models is that stock options and currency options are analyzed in separate contexts the co movement of the stock market and the currency market is absent from the option valuation analysis such co movement is extremely important and is best illustrated by the southeast asian financial crisis to overcome this drawback this paper uses an equilibrium model to investigate the joint dynamics of the exchange rate and the market portfolio in a small open monetary economy with jump diffusion money supplies and aggregate dividends it is shown that the exchange rate and the market portfolio are strongly correlated since both are driven by the same economic fundamentals furthermore options on the exchange rate and the market portfolio are evaluated in the same equilibrium context the analysis shows that parameters describing the same economic fundamentals have very different effects on currency and stock options

the stochastic volatility in mean model empirical evidence from international stock markets in this paper we present an exact maximum likelihood treatment for the estimation of a stochastic volatility in mean svm model based on monte carlo simulation methods the svm model incorporates the unobserved volatility as an explanatory variable in the mean equation the same extension is developed elsewhere for autoregressive conditional heteroscedastic arch models known as the arch in mean arch m model the estimation of arch models is relatively easy compared with that of the stochastic volatility sv model however efficient monte carlo simulation methods for sv models have been developed to overcome some of these problems the details of modifications required for estimating the volatility in mean effect are presented in this paper together with a monte carlo study to investigate the finite sample properties of the svm estimators taking these developments of estimation methods into account we regard sv and svm models as practical alternatives to their arch counterparts and therefore it is of interest to study and compare the two classes of volatility models we present an empirical study of the intertemporal relationship between stock index returns and their volatility for the united kingdom the united states and japan this phenomenon has been discussed in the financial economic literature but has proved hard to find empirically we provide evidence of a negative but weak relationship between returns and contemporaneous volatility which is indirect evidence of a positive relation between the expected components of the return and the volatility process copyright 2002 john wiley sons ltd

pricing european currency options a comparison of the modified black scholes model and a random variance model we use the modified black scholes model and a random variance option pricing model to study prices of european currency options traded in geneva the options which cannot be exercised early include calls and puts on the dollar swiss franc exchange rate in the empirical analysis we examine the model fit and the biases with respect to the strike price time to maturity and volatility there is some evidence of mispricing and there are small gains available by trading with the random variance model

stochastic volatility option pricing this paper examines alternative methods for pricing options when the underlying security volatility is stochastic we show that when there is no correlation between innovations in security price and volatility the characteristic function of the average variance of the price process plays a pivotal role it may be used to simplify fourier option pricing techniques and to implement simple power series methods we compare these methods for the alternative mean reverting stochastic volatility models introduced by stein and stein 1991 and heston 1993 we also examine the biases in the black scholes model that are eliminated by allowing for stochastic volatility and we correct some errors in the stein and stein 1991 analysis of this issue empirical evidence on underlying asset prices and on their derivatives strongly suggests that asset price volatility is stochastic the pricing of options under this condition is therefore an important problem in this paper we study alternative option pricing methods that account for stochastic volatility we are particularly concerned with power series methods which we show to be quite accurate and easy to implement for alternative volatility specifications we point out their relation with recently proposed exact methods this permits a precise assessment of the approximation involved in the simple power series approach and of the impact of stochastic volatility on option prices following garman 1976 stochastic volatility option prices must satisfy a bivariate fundamental partial differential equation pde in the two state variables security price and volatility since volatility is not spanned by assets in the econ omy the volatility risk may not be eliminated by arbitrage methods therefore its market price explicitly enters into the pde the associated risk premium is owen graduate school of management vanderbilt university nashville tn 37203 and universita di siena facolta di scienza economiche e bancarie 53100 siena italy respectively part of this research was supported from a grant from the dean s fund and the financial markets research center at the owen school of management vanderbilt university some of this research was completed while roma was visiting the anderson graduate school of management ofthe university of california at los angeles we thank participants of the finance accounting and economics workshop at the owen school of management vanderbilt university for useful comments we appreciate the suggestions of roger huang craig lewis ron masulis and walter torous we thank joanne ball for editorial

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 arbitrage pricing model with stochastic volatility and jumps we formulate and test a continuous time asset pricing model using u s equity market data we assume that stock returns are driven by common factors including random jump size poisson processes and brownian motions with stochastic volatility the model places overidentifying restrictions on the mean returns allowing one to identify risk neutral probability distributions useful in pricing derivative securities we test for the restrictions and decompose moments of the asset returns into the contributions made by different factors our econometric methods take full account of time aggregation

hedging the risks from writing foreign currency options abstract this paper considers the ways in which banks and other financial institutions can hedge their risks when they write non exchange traded foreign currency options key factors affecting the performance of delta hedging are identified and hedging schemes involving the use of exchange traded options are analyzed the schemes are tested using both simulated data and data from trades on the philadelphia exchange between february 1983 and september 1984

arbitrage tests of the efficiency of the foreign currency options market in this paper the lower boundary excercise price and put call parity conditions for foreign currency options are subjected to empirical testing the tests are directed towards the examination of the hypothesis that the foreign currency option market is efficient the evidence in the ex post tests is inconsistent with this hypothesis since a large number of violations of theoretical conditions are found in the data

tobin s imperfect asset substitution in optimizing general equilibrium in this paper we present a dynamic optimizing model that allows explicitly for imperfect substitutability between different financial assets this is specified in a manner which captures tobin s 1969 view that an expansion of one asset s supply affects both the yield on that asset and the spread or risk premium between returns on that asset and alternative assets our estimates of this model on u s data confirm that some of the observed deviations of long term rates from the expectations theory of the term structure can be traced to movements in the relative stocks of financial assets the richer aggregate demand and asset specifications imply that there exists an additional channel of monetary policy our results suggest that central bank operations exercise a modest influence on the relative prices of alternative financial securities and so exert an extra effect on long term yields and aggregate demand separate from their effect on the expected path of short term rates

futures prices as risk adjusted forecasts of monetary policy many researchers have used federal funds futures rates as measures of financial markets expectations of future monetary policy however to the extent that federal funds futures reflect risk premia these measures require some adjustment in this paper we document that excess returns on federal funds futures have been positive on average and strongly countercyclical in particular excess returns are surprisingly well predicted by macroeconomic indicators such as employment growth and financial business cycle indicators such as treasury yield spreads and corporate bond spreads excess returns on eurodollar futures display similar patterns we document that simply ignoring these risk premia significantly biases forecasts of the future path of monetary policy we also show that risk premia matter for some futures based measures of monetary policy shocks used in the literature

asset prices and exchange rates in this paper we study the implications of introducing demand shocks and trade in goods into an otherwise standard international asset pricing model trade in goods gives rise to an additional channel of international propagation through the terms of trade absent in traditional single good asset pricing models the inclusion of demand shocks helps overturn many unrealistic implications of existing international flnance models in which productivity shocks are the sole source of uncertainty our model generates a rich set of implications on how stock bond and foreign exchange markets co move we solve the model in closed form which yields a system of equations that can be readily estimated empirically our estimation validates the main predictions of the theory

antitrust in innovative industries we study the effects of antitrust policy in industries with continual innovation antitrust policies that restrict incumbent behavior toward new entrants may have conflicting effects on innovation incentives raising the profits of new entrants but lowering those of continuing incumbents we show that the direction of the net effect can be determined by analyzing shifts in innovation benefit and supply holding the innovation rate fixed we apply this framework to analyze several specific antitrust policies we also show that in some cases the tension does not arise and policies that protect entrants necessarily raise the rate of innovation

strategic incentives for innovations and market competition abstract we consider a principal agent model to provide a general analysis of how risk affects incentives of firms who invest in cost reducing r d and compete in the product market we specify the conditions under which higher risk reduces incentives of all firms we also examine the conditions under which an increase in risk may trigger opposite responses of rivals in the same industry some firms will strengthen while other firms will weaken the incentives provided to their agents this result holds regardless of the mode of competition in the product market cournot or bertrand as long as the rivals r d decisions are strategic substitutes it can generate new empirical implications and can provide an explanation for the lack of strong empirical support in the literature for a negative relationship between risk and incentives we also discuss policy implications regarding the effect of risk on the incentives to innovate and welfare

how important is the correlation between returns and volatility in a stochastic volatility model empirical evidence from pricing and hedging in the s p 500 index options market abstract this paper examines the importance of allowing for correlation between returns and volatility in a continuous time stochastic volatility option pricing model specifically it tests the closed form stochastic volatility model of heston review of financial studies 6 1993 327 343 that allows for non zero correlation in terms of pricing and hedging options on the s p 500 index it is found that non zero correlation in the stochastic volatility model leads to significant improvements in mispricing of out of the money options and overall pricing performance compared to if correlation is constrained to be zero in terms of hedging non zero correlation results in significantly lower hedging errors for out of the money options

mergers of complements and entry in innovative industries abstract i study a merger between producers of complement inputs facing potential entry with investment by the incumbents in deterministic cost reduction and by the entrants in probabilistic innovation and then competition in prices the merger solves cournot complementarity problems in investment and pricing which is what makes it profitable but also potentially anti competitive when the demand is inelastic the merger harms consumers by reducing r d of the entrants if the incumbents are efficient enough always when bundling is adopted instead with a demand elastic enough the merger increases consumer surplus even with bundling

using changes in auction maturity sectors to help identify the impact of qe on gilt yields this article uses a novel way of identifying part of the impact of quantitative easing qe on gilt yields using natural experiments associated with bank of england announcements about changes in the maturity distribution of future gilt purchases we find that changes in expected qe purchases had a significant effect on gilt yields following each announcement in march 2009 august 2009 and february 2012 the local supply effects we identify appear to be important they may account for around half of the total impact on gilt yields in these events and are passed through to yields of related assets

monetary policy in exceptional times this paper describes the way in which the european central bank ecb the federal reserve and the bank of england conducted monetary policy since the beginning of the financial crisis in august 2007 we argue that both quantitative easing and the other non standard measures introduced by central banks that changed the composition of the asset side of their balance sheets so called qualitative easing acted mainly through their effects on interest rates and in particular on money market spreads rather than solely through quantity effects in terms of the money supply we perform a quantitative exercise on the euro area which estimates the effect of the reduction of these spreads to the broader economy michele lenza huw pill and lucrezia reichlin

statistical inference for random variance option pricing this article deals with the estimation of continuous time stochastic volatility models of option pricing we argue that option prices are much more informative about the parameters than are asset prices this is confirmed in a monte carlo experiment that compares two very simple strategies based on the different information sets both approaches are based on indirect inference and avoid any discretization bias by simulating the continuous time model we assume an ornstein uhlenbeck process for the log of the volatility a zero volatility risk premium and no leverage effect we do not pursue asymptotic efficiency or specification issues rather we stick to a framework with no overidentifying restrictions and show that given our option pricing model estimation based on option prices is much more precise in samples of typical size without increasing the computational burden

equilibrium valuation of foreign exchange claims this article studies the equilibrium valuation of foreign exchange contingent claims within a continuous time lucas 1982 two country model exchange rates interest rates and in particular factor risk prices are all endogenously and jointly determined this guarantees the internal consistency of these price processes with a general equilibrium in the same model closed form valuation formulas are presented for currency options and currency futures options common to these formulas is that stochastic volatility and stochastic interest rates are admitted hedge ratios and other comparative statics are also provided analytically it is shown that most existing currency option models are included as special cases this article studies the equilibrium valuation and hedging of foreign exchange contingent claims the framework for analysis is the continuous time counterpart of the well known two country monetary model of lucas 1982 1 that is we use the modeling structure of lucas 1982 and adopt his representativeagent perfect pooling equilibrium notion rather than extending the lucas setup to a cox ingersoll and ross 1985a henceforth cir production economy as is done in nielsen and saa requejo 1993 for our purpose the lucas framework offers the desired simplicity and tractability we assume a stochastic structure for the international economy such that the resulting nominal interest rates and exchange rate dynamics exhibit similar empirically plausible features as the corresponding ones in nielsen and saa requejo 1993 for example the endogenous interest rates are positively correlated across national borders campbell and clarida 1987 and ilmanen 1995 as a predictor of future spot exchange rates the equilibrium forward exchange rate is biased in a direction consistent with the forward premium puzzle

predicting volatility in the foreign exchange market measures of volatility implied in option prices are widely believed to be the best available volatility forecasts in this article we examine the information content and predictive power of implied standard deviations isds derived from chicago mercantile exchange options on foreign currency futures the article finds that statistical time series models even when given the advantage of ex post parameter estimates are outperformed by isds isds however also appear to be biased volatility forecasts using simulations to investigate the robustness of these results the article finds that measurement errors and statistical problems can substantially distort inferences even accounting for these however isds appear to be too variable relative to future volatility it is widely believed that the volatility implied in option prices is the market s best estimate of future volatility after all if it were not one could devise a trading strategy that could generate profits by identifying mispriced options the purpose of this article is to investigate the information content and predictive power of volatility implied in options on foreign currencies the paper focuses on options on currency futures traded on the chicago mercantile exchange cme because of the depth and liquidity of cme futures and options traded side by side in the same market implied standard deviations isds allow for clean tests of the predictive power of implied volatilities early studies of the information content of isds have generally found that these contain substantial information for future volatility latane and rendleman 1976 chiras and manaster 1978 and beckers 1981 for example regress future volatility on the weighted implied volatility across a broad sample of chicago board options exchange cboe stocks and find that options contain volatility forecasts that are more accurate than historical measures 1 these studies performed shortly after the 1973 beginning of the cboe option market could only use a relatively short time span and therefore focused on cross sections rather than time series predictions

the incentives for cost reduction in a differentiated industry abstract this paper investigates how the incentives for cost reduction in a differentiated industry depend upon the degree of product substitutability when goods are imperfect substitutes both cournot and bertrand competition result in underinvestment in the sense that a social planner would be willing to pay more for a given cost reduction than a profit maximizing firm overinvestment may occur when the goods are sufficiently close substitutes similarly cournot competition provides a stronger incentive to innovate than bertrand competition if the degree of substitutability is low and a weaker incentive if this degree is high

competition and growth with step by step innovation an example this paper develops a simple example to analyse the relationship between product market competition and growth in a model with step by step innovations where laggards can never leapfrog the current industry leaders but instead must first catch up with the leaders before battling for technological leadership in the future unlike in existing schumpeterian models of growth more intense product market competition and or imitations may be growth enhancing

the response of interest rates to us and uk quantitative easing we analyse declines in government bond yields following announcements by the federal reserve and the bank of england of plans to buy longer term debt using dynamic term structure models we decompose us and uk yields into expectations about future short term interest rates and term premiums we find that declines in us yields mainly reflected lower expectations of future short term interest rates while declines in uk yields appeared to reflect reduced term premiums thus the relative importance of the signalling and portfolio balance channels of quantitative easing may depend on market institutional structures and central bank communication policies

on the dynamic efficiency of bertrand and cournot equilibria abstract this paper compares bertrand and cournot equilibria in a differentiated duopoly with r d research and development competition it shows that cournot competition induces more r d effort than bertrand competition however the price is lower and output is larger in bertrand than in cournot competition furthermore the bertrand equilibrium is more efficient than the cournot equilibrium if either r d productivity is low or spillovers are weak or products are very different if r d productivity is high spillovers are strong and goods are close substitutes then the bertrand equilibrium islessefficient than the cournot equilibrium journal of economic literatureclassification number l13

option pricing when the variance is changing the monte carlo method is used to solve for the price of a call when the variance is changing stochastically

market structure innovation and vertical product differentiation abstract we reassess arrow s 1962 economic welfare and the allocation of resources for invention in nber the rate and direction of innovative activity princeton university press princeton nj results concerning the effect of market structure on the returns from process innovation here we consider product innovations that are vertically differentiated from older products in the sense of shaked and sutton 1982 relaxing price competition through product differentiation review of economic studies 49 3 13 shaked and sutton 1983 natural oligopolies econometrica 51 1469 1484 competition and monopoly in the old product market provide identical returns to innovation when i the monopolist is protected from new product entry and ii innovation is non drastic in the sense that the monopolist supplies positive quantities of both old and new products if the monopolist can be threatened with entry monopoly provides strictly greater incentives welfare may be greater under monopoly when innovation is valuable

managerial incentives and product market competition are imperfectly competitive leibenstein 1966 claims that there may be a substantial amount of x inefficiency where x inefficiency measures the degree to which actual profits depart from the maximum of profits that could be obtained if all operations in the firm were carried out at minimal costs he offers empirical evidence from case studies showing that the welfare loss due to organizational slack is of an order of magnitude bigger than the welfare loss due to monopolistic price distortions on imperfectly competitive markets these results support the common presumption that increasing competition reduces organizational and in particular managerial slack however this early literature does not offer a theoretical explanation for the link between competition and managerial incentives in particular it ignores the fact that managerial incentives can be affected by the design of an incentive scheme in this paper i derive the optimal incentive scheme for a manager as a function of the competitiveness of the environment in which his firm operates the basic impact of increased competition is that it reduces the profits of a firm this has two effects in the model first if a firm has high costs then the reduction of profits may be sufficient to render the firm unprofitable so the probability that it has to be liquidated goes up this unambiguously induces the manager of the firm to work harder for a cost reduction in order to avoid liquidation and to keep his job second the reduction in profits may affect

the validity of the event study approach evidence from the impact of the fed s monetary policy on us and foreign asset prices this paper documents the effects of changes in us monetary policy on asset prices in 51 countries to evaluate the validity of the event study approach we find that the event study estimates contain a significant bias however this bias is fairly small and the ordinary least squares approach tends to outperform in an expected squared error sense the heteroscedasticity based estimator for both small and large sample sizes hence in general the event study methodology should be preferred moreover we show that us monetary policy has been an important determinant of global financial markets

the ecb and the interbank market this paper analyses the impact on the macroeconomy of the ecb s non standard monetary policy implemented in the aftermath of the collapse of lehman brothers in the fall of 2008 we study in particular the effect of the expansion of the intermediation of transactions across central bank balance sheets as dysfunctional financial markets seize up which we regard as a key channel of transmission for non standard monetary policy measures our approach is similar to lenza et al 2009 but we introduce the important innovation of distinguishing between private intermediation of interbank transactions in the money market and central bank intermediation of bank to bank transactions across the eurosystem balance sheet we do this by exploiting data drawn from the aggregate monetary and financial institutions mfi balance sheet which allows us to construct a new measure of the policy shock represented by the ecb s increasing role as a financial intermediary we find that bank loans to households and in particular to non financial corporations are higher than would have been the case without the ecb s intervention in turn the ecb s support has a significant impact on economic activity two and a half years after the failure of lehman brothers the level of industrial production is estimated to be 2 higher and the unemployment rate 0 6 percentage points lower than would have been the case in the absence of the ecb s non standard monetary policy measures

the sensitivity of strategic and corrective r d policy in oligopolistic industries abstract we evaluate the case for r d subsidies in export sectors when the outcome of r d is uncertain and the product market is oligopolistic when r d reduces expected costs in the particular sense of first order stochastic dominance a national strategic basis for r d subsidies exists whether firms choose prices or quantities this must be balanced against a corrective incentive to tax r d whenever the number of domestic firms exceeds one however when r d increases the riskiness of the cost distribution as well the results may switch there emerges a strategic incentive to tax and a corrective incentive to subsidize r d

reaching for yield and the diabolic loop in a monetary union abstract we use the theoretical framework of acharya and naqvi 2019 to introduce a macro financial model where the reaching for yield incentivized by a loosening monetary policy in the united states mitigates the diabolic loop in a monetary union we provide empirical evidence that the introduction of an accommodative monetary policy by the fed lowers the yields in us assets and increases liquidity and by extension the threshold above which a liquidity shock can damage a bank this in turn incentivizes bank managers to optimize their portfolios by investing in risky assets we use a monetary var to provide novel empirical evidence that there is an increase in the flow of funds to european assets a result which can be attributed to the reaching for yield incentive this portfolio balance channel attenuates the effects of financial fragility and improves government funding costs as well as credit conditions by providing liquidity to domestic banks and assets as a result the reaching for yield incentive mitigates the diabolic loop effect

competition imitation and growth with step by step innovation is more intense product market competition and imitation good or bad for growth this question is addressed in the context of an endogenous growth model with step by step innovations in which technological laggards must first catch up with the leading edge technology before battling for technological leadership in the future in contrast to earlier schumpeterian models in which innovations are always made by outsider firms who earn no rents if they fail to innovate and become monopolies if they do innovate here we find first that the usual schumpeterian effect of more intense product market competition pmc is almost always outweighed by the increased incentive for firms to innovate in order to escape competition so that pmc has a positive effect on growth second that a little imitation is almost always growth enhancing as it promotes more frequent neck and neck competition but too much imitation is unambiguously growth reducing the model thus points to complementary roles for competition anti trust policy and patent policy

tests of an american option pricing model on the foreign currency options market this paper tests the ability of the american option pricing model proposed by parkinson 18 or mason 14 to explain the pricing of the foreign currency options traded on the philadelphia stock exchange from february 28 1983 to march 26 1985 we find that the model underprices out of the money options relative to at the money and in the money options this relative underpricing is driven by an underpricing of out of the money call options of short maturity in addition the degree of relative mispricing for most categories of options is shown to be a decreasing function of the time to maturity of the options longer maturity options appear to trade at similar levels of implied volatility whether they are in at or out of the money most of these biases appear consistent with the fact that the underlying spot currency rate follows a mixed jump diffusion process as described in 17

the pricing of call and put options on foreign exchange this paper derives pricing equations for european puts and calls on foreign exchange the call and put pricing formulas are unlike the black scholes equations for stock options in that there are two relevant interest rates interest rates are stochastic and boundary constraints differ in addition it is shown that both american call and put options have values larger than their european counterparts

does globalization create superstars a simple theory of managerial wages abstract to examine the impact of globalization on managerial remuneration we consider a matching model where firms compete both in the product market and in the managerial market we show that globalization i e the simultaneous integration of product markets and managerial pools leads to an increase in the heterogeneity of managerial salaries typically while the most able managers obtain a wage increase less able managers are faced with a reduction in wages hence our model is consistent with the increasing heterogeneity of ceo remuneration that has been observed in the last few decades

competition market selection and growth we study the effect of the competitive selection process on the economy s rate of growth in an extension of standard quality ladder models of endogenous growth we allow for the possibility that in each period several asymmetric firms representing an endogenously determined number of past innovators may be simultaneously active in an industry stronger competitive pressure then has conflicting effects on the incentive to innovate lowering prices but also selecting the more efficient firms we show that the market selection effect of competition always increases the incentive to innovate and find circumstances in which it can outweigh the traditional negative effect of lower prices

option values under stochastic volatility theory and empirical estimates abstract this paper numerically solves the call option valuation problem given a fairly general continuous stochastic process for return volatility statistical estimators for volatility process parameters are derived and parameter estimates are calculated for several individual stocks and indices the resulting estimated option values do not differ dramatically from black scholes values in most cases although there is some evidence that for longer maturity index options black scholes overvalues out of the money calls in relation to in the money calls

on the normal inverse gaussian stochastic volatility model in this article the normal inverse gaussian stochastic volatility model of barndorff nielsen is extended the resulting model has a more flexible lag structure than the original one in addition the second and fourth order moments important properties of a volatility model are derived the model can be considered either as a generalized autoregressive conditional heteroscedasticity model with nonnormal errors or as a stochastic volatility model with an inverse gaussian distributed conditional variance a simulation study is made to investigate the performance of the maximum likelihood estimator of the model finally the model is applied to stock returns and exchange rate movements its fit to two stylized facts and its forecasting performance is compared with two other volatility models

threshold arch models and asymmetries in volatility this paper attempts to enlarge the class of threshold heteroscedastic models tarch introduced by zakoian 1991a we show that it is possible to relax the positivity constraints on the parameters of the conditional variance unconstrained models provide a greater generality of the paths allowing for nonlinearities in the volatility cyclical behaviour is permitted as well as different relative impacts of positive and negative shocks on volatility depending on their size we give empirical evidence using french stock returns

price pressure in the government bond market what determines the term structure of interest rates standard economic theory links the interest rate for maturity t to the willingness of a representative agent to substitute consumption between times 0 and t the standard model contrasts sharply with a more informal view based on investors preferred habitat proposed by john culbertson 1957 and franco modigliani and richard sutch 1966 according to the preferred habitat view there are investor clienteles with preferences for specific maturities and the interest rate for a given maturity is influenced by the demand of the corresponding clientele and the supply of bonds with that maturity for example the typical clientele for long term bonds are pension funds an increase in their demand would be expected to raise prices of long term bonds and thus lower long term interest rates in short preferred habitat implies that there is price pressure in the bond market while the preferred habitat view has intuitive appeal it has not entered into the academic mainstream typically being relegated to a paragraph in mba level textbooks one reason for this is the mixed findings in early empirical studies of the term structure specifically between 1962 and 1964 the us treasury and federal reserve raised the supply of short term government debt while simultaneously lowering the supply of long term debt this program known as operation twist aimed to raise shortterm interest rates and so improve the balance of payments while also lowering long term rates to stimulate private investment a number of papers evaluated operation twist and while they reached different conclusions none found strong evidence that the operation was effective in flattening the term structure e g modigliani price pressure in the government bond market

have we underestimated the likelihood and severity of zero lower bound events prior to the financial crisis most economists probably did not view the zero lower bound zlb as a major problem for central banks using a range of structural and statistical models we find that previous research understated the zlb threat by ignoring uncertainty about model parameters and latent variables focusing too much on the great moderation experience and relying on structural models whose dynamics cannot generate sustained zlb episodes our analysis also suggests that the federal reserve s asset purchases while materially improving macroeconomic conditions did not prevent the zlb constraint from having first order adverse effects on real activity and inflation

the federal reserve s large scale asset purchase programmes rationale and effects we provide empirical estimates of the effect of large scale asset purchases lsaps on longer term us treasury yields within a framework that allows for several transmission channels including the scarcity channel associated with the preferred habitat literature and the duration channel associated with interest rate risk we also clarify lsaps role in the broader context of historical monetary policy strategy results indicate that lsap style operations mainly impact longer term rates via the nominal term premium within that premium the response is predominantly embodied in the real term premium the scarcity and duration channels both seem to be of considerable importance

measuring the reaction of monetary policy to the stock market movements in the stock market can have a significant impact on the macroeconomy and are therefore likely to be an important factor in the determination of monetary policy however little is known about the magnitude of the federal reserve s reaction to the stock market in part because the simultaneous response of equity prices to interest rates makes it difficult to estimate this paper uses an identification technique based on the heteroskedasticity of stock market returns to measure the reaction of monetary policy to the stock market we find a significant policy response with a 5 percent rise fall in the s p 500 index increasing the likelihood of a 25 basis point tightening easing by about a half

market based measures of monetary policy expectations a number of recent articles have used different financial market instruments to measure near term expectations of the federal funds rate and the high frequency changes in these instruments around federal open market committee announcements to measure monetary policy shocks this article evaluates the empirical success of a variety of financial market instruments in predicting the future path of monetary policy all of the instruments we consider provide forecasts that are clearly superior to those of standard time series models at all of the horizons considered among financial market instruments we find that federal funds futures dominate all the other securities in forecasting monetary policy at horizons out to six months for longer horizons the predictive power of many of the instruments we consider is very similar in addition we present evidence that monetary policy shocks computed using the current month federal funds futures contract are influenced by changes in the timing of policy actions tha

market response to policy initiatives during the global financial crisis abstract this paper examines the impact of macroeconomic and financial sector policy announcements in the united states the united kingdom the euro area and japan on interbank credit and liquidity risk premia during the recent crisis overall policy interventions were associated with a reduction in interbank risk premia most significantly for recapitalization programs by contrast decisions to bail out individual banks in an ad hoc manner or let them fail were accompanied by a significant rise in interbank risk premia most policy announcements had international spillovers these results are broadly robust to using alternative measures of financial distress and varying the size of the event window

dollar jump fears 1984 1992 distributional abnormalities implicit in currency futures options abstract deutsche mark and yen futures options over 1984 1992 and 1986 1992 respectively are examined for deviations from the lognormal assumption underlying standard option pricing models two methods are used an atheoretic skewness premium and daily estimates of moments using a model for pricing american foreign currency futures options under systematic exchange rate jump risk substantial variation over time is found in all moments including implicit skewness and kurtosis the implicit abnormalities predict future abnormalities in log differenced dm futures prices but not yen the peso problem implications do not explain standard rejections of uncovered interest parity

cross border spillover effects of unconventional monetary policies on swiss asset prices abstract unconventional monetary policies umps announced by the federal reserve the european central bank the bank of england and the bank of japan exert important spillover effects on asset prices in switzerland using a broad ump event set and a long term bond futures based measure of market anticipation we show that surprisingly expansionary umps lower swiss government and corporate bond yields induce the swiss franc to appreciate and dampen swiss equity prices four extensions provide further insights first the estimated effects are strongest for announcements by the ecb second the impact on government bonds is largest for bonds with residual maturities of 7 10 years third the impact of foreign ump shocks on exchange rates and swiss bond yields is less pronounced after the introduction of the minimum rate of 1 20 swiss franc per euro by the swiss national bank on september 6 2011 indicating that domestic monetary policy action partially affects the impact of external monetary shocks on domestic financial markets fourth the sign of spillover effects differs for positive and negative ump surprises but their strength does not

rationalizability learning and equilibrium in games with strategic complementarities we study a rich class of noncooperative games that includes models of oligopoly competition macroeconomic coordination failures arms races bank runs technology adoption and diffusion r d competition pretrial bargaining coordination in teams and many others for all these games the sets of pure strategy nash equilibria correlated equilibria and rationalizable strategies have identical bounds also for a class of models of dynamic adaptive choice behavior that encompasses both best response dynamics and bayesian learning the players choices lie eventually within the same bounds these bounds are shown to vary monotonically with certain exogenous parameters we study the class of noncooperative supermodular games introduced by topkis 1979 and further analyzed by vives 1985 1989 who also pointed out the importance of these games in industrial economics supermodular games are games in which each player s strategy set is partially ordered the marginal returns to increasing one s strategy rise with increases in the competitors strategies so that the game exhibits strategic complementarity 2 and if a player s strategies are multidimensional marginal returns to any one com ponent of the player s strategy rise with increases in the other components this class turns out to encompass many of the most important economic applications of noncooperative game theory in macroeconomics diamond s 1982 search model and bryant s 1983 1984 rational expectations models can be represented as supermodular games in each of these models more activity by some members of the economy raises the returns to increased levels of activity by others in oligopoly theory some models of bertrand oligopoly with differentiated products qualify as supermodu lar games in these games when a firm s competitors raise their prices the marginal profitability of the firm s own price increase rises a similar structure is present in games of new technology adoption such as those of dybvig and spatt 1983 farrell and saloner 1986 and katz and shapiro 1986 when more users hook into a communication system or more manufacturers adopt an interface standard the marginal return to others of doing the same often rises similarly in some specifications of the bank runs model introduced by diamond and dybvig 1983 when more depositors withdraw their funds from a bank it is more worthwhile for other depositors to do the same in the warrant exercise

the components of the return from hedging options against stocks in a previous paper galai 1977 i estimated the profits that could have been made by following a hedging strategy which consisted of a position in an option traded on the chicago board options exchange cboe and an offsetting position in a fraction of a share of the underlying stock the paper concluded that 1 the trading strategies based on the black scholes model black and scholes 1973 perform well in tests of the ex post hedge return 2 the market did not seem perfectly efficient to market makers the ex ante returns while usually statistically significant show a strong tendency to be positive p 195 in this article the profits from the hedging i strategies with options are further analyzed the returns are decomposed to a few components in order to achieve a better understanding and additional insight into their character two main factors will be shown to combine to give the hedge return the profits or losses from discrete ad

competition and investment a unified approach using a simple but general two stage framework this paper identifies the circumstances under which increasing competition leads to more cost reducing investments the framework can for instance capture increasing substitutability for different types of oligopoly models or changes from cournot to bertrand competition the paper identifies four transmission mechanisms by which competition affects investment for a firm with lower initial marginal costs higher efficiency a positive effect of competition on investment is more likely positive spillovers support a negative effect of competition on investment the relation between competition and investment is not affected in an unambiguous way by the level of pre existing competition

what does monetary policy do to long term interest rates at the zero lower bound this article uses a structural var with daily data to identify the effects of monetary policy shocks on various longer term interest rates since the federal funds rate has been stuck at the zero lower bound the var is identified using the assumption that monetary policy shocks are heteroskedastic monetary policy shocks have especially high variance on days of fomc meetings and certain speeches while there is otherwise nothing unusual about these days a complementary high frequency event study approach is also used i find that stimulative monetary policy shocks lower treasury and corporate bond yields but the effects die off fairly fast

the effects of competition on executive behavior economists presume that competition spurs a firm to be more efficient by forcing it to reduce its agency problems this article investigates this presumption it finds that the effects of competition on executive behavior can be decomposed into four effects each of which is of potentially ambiguous sign theory thus offers no definitive defense of this presumption this article also derives sets of conditions under which increased competition has the presumed effect of reducing agency problems in some sets important conditions are that increased competition reduce the executive s expected income and that agency goods e g shirking be normal goods for the executive the article shows that an increase in the shareholder bargaining strength can both reduce the agency problem and make it more sensitive to competition

nonparametric tests of alternative option pricing models using all reported trades and quotes on the 30 most active cboe option classes from august 23 1976 through august 31 1978

quantitative easing and unconventional monetary policy an introduction this article assesses the impact of quantitative easing and other unconventional monetary policies followed by central banks in the wake of the financial crisis that began in 2007 we consider the implications of theoretical models for the effectiveness of asset purchases and look at the evidence from a range of empirical studies we also provide an overview of the contributions of the other articles in this feature

valuation of american call options on dividend paying stocks empirical tests abstract this paper examines the pricing performance of the valuation equation for american call options on stocks with known dividends and compares it with two suggested approximation methods the approximation obtained by substituting the stock price net of the present value of the escrowed dividends into the black scholes model is shown to induce spurious correlation between prediction error and 1 the standard deviation of stock return 2 the degree to which the option is in the money or out of the money 3 the probability of early exercise 4 the time to expiration of the option and 5 the dividend yield of the stock a new method of examining option market efficiency is developed and tested

public policy towards r d in oligopolistic industries the importance of determining optimal policy towards r d cannot be exaggerated given the worldwide interest in fostering r d and given the significant differences between european and u s policies towards interfirm cooperation on r d moreover the problem is an inherently difficult one because of the complex nature of the r d process since r d is a component of fixed costs industries where it is important tend to be concentrated hence r d policy must go hand in hand with competition policy at the same time r d is like any form of investment in that it precedes the production stage hence issues of time consistency and strategic commitment inevitably arise in considering the choice of r d policy finally r d by one firm typically leads to spillovers wbich benefit other firms so that r d exhibits many of the character department of economics university college dublin belfield dublin 4 ireiatid for helpful discussions and comments we are grateful to two anonymous referees to pedro bartos steve martin massimo motta and damien neven and to participants at seminars in birmingham st andrew s and warwick at a cepr workshop on r d spillovers in lausanne at erwit 94 in caslel gandolfo eea 95 in prague the 1996 conference on industrial economics at universidad carlos iii de madrid and a meeting of the dublin economics workshop this paper was produced as part of the international economic performance programme of the centre for economic performance london school of economics supported by the u k esrc an earlier version was circulated as cepr discussion paper no 1243 see alexis jacquemin 1988 and stephen martin 1996 istics of a public good albeit one that is mostly privately produced tbe degree to which such spillovers occur and can be internalized is another crucial influence on the desirable pattem of intervention