the bond old bond spread abstract i document the profits on a trade that is long the old 30 year treasury bond and short the new 30 year treasury bond and is rolled over every auction cycle from june 1995 to november 1999 despite the systematic convergence of the spread over the auction cycle the average profits are close to zero the difference in repo market financing rates between the two bonds is a significant cost of carry in this trade i show that variation in the bond old bond spread is driven by the treasury supply of 30 year bonds as well as aggregate factors affecting investors preference for liquid assets

bond liquidity premia recent asset pricing models of limits to arbitrage emphasize the role of funding conditions faced by financial intermediaries in the us the repo market is the key funding market then the premium of on the run u s treasury bonds should share a common component with risk premia in other markets

the term structure of illiquidity premia abstract we investigate the term structure of bond market illiquidity premia and show that the term structure varies greatly over time short and long end are strictly separated suggesting that different economic factors drive different parts of the term structure we propose a stylized theoretical model which implies that current trading needs of investors determine the short end the long term risk of being forced to liquidate bond positions determines the long end empirical evidence supports these predictions while short term liquidation risk captured by asset market volatilities drives the short end the long end depends on the long term economic outlook

salomon brothers and the may 1991 treasury auction analysis of a market corner abstract in may 1991 the treasury sold 12 29 billion in two year notes through improper bidding salomon brothers gained control of at least 86 percent of the issue this study investigates the impact of salomon s attempted corner by examining the postauction price behaviour of the two year note based on a no arbitrage relation the results show that the two year note was substantially overpriced for approximately six weeks following the auction the typical mispricing during this period is estimated at 0 16 to 0 25 percent of par in dollar terms the aggregate misvaluation averaged 20 30 million and by controlling the supply of the issue salomon stood to gain substantially from the squeeze

litigation and settlement in patent infringement cases a patent grants its owner the right to sue intruders that have been identified the patentholder must then supervise the market and react in case of infringement his reaction may be to go to court to settle or to accept entry we investigate how intensive the monitoring effort should be and how it will influence the entry decision in a simultaneous game even if the penalty paid by the infringer in case of a finding of liability is high the patentholder may prefer a settlement to a trial the likelihood of entry may increase with the penalty in sequential games regardless who plays first entry occurs comparatively less often than in the simultaneous game

patenting in the shadow of competitors this article empirically examines the patenting behavior of new biotechnology firms that have different litigation costs i show that firms with high litigation costs are less likely to patent in subclasses with many other awards particularly those of firms with low litigation costs this pattern is consistent with the literature on costly litigation which suggests that firms that have high litigation costs will take greater precautions to avoid litigation these results are robust to a variety of control variables and modifications that seek to test alternative explanations

an introduction to the law and economics of intellectual property although economists have written on topics of intellectual property for a long time the impact of economics on public policy in this area has been slight especially as compared to the influence of professional writings in areas such as antitrust and taxation we believe that too few of the profession s resources have been devoted to these issues and that of those resources that have been employed too few have been devoted to empirical analyses we hope that this introductory essay and the three papers that follow will stimulate interest in this subject this introductory essay first describes some of the basic economic tradeoffs involved in intellectual property law and then describes the framework of the law in the six areas described above patent copyright semiconductor protection trademark trade secret and misappropriation it is intended both to provide thumbnail descriptions of the various intellectual property regimes to economists working in this area and to indicate where additional economic research might be useful

term premiums in bond returns abstract this paper examines expected returns on u s treasury bills and on u s government bond portfolios expected bill returns are estimated from forward rates and from sample average returns both estimation methods indicate that expected returns on bills tend to peak at eight or nine months and never increase monotonically out to twelve months reliable inferences are limited to treasury bills and thus to maturities up to a year the variability of longer term bond returns preempts precise conclusions about their expected returns

the development of urban labour markets china s urban wage curve 1980 92 this study explores the effect of china s economic reforms and growth on a critical outcome of labour market interactions wage levels provincial data from 1980 to 1992 are used to analyse changes in interregional wage differentiation and the relationship between average and real wages and a variety of economic variables the results illuminate the increasing role of market forces particularly labour demand variables such as economic growth and foreign investment in determining wage levels and explaining the pattern of first declining and then sharply rising interregional wage differentials in the 1980s and early 1990s at the same time the empirical results highlight the persistence of barriers to labour mobility across regions and enterprises of different ownership types these findings suggest that the evolution of china s urban labour market to date is marked by a combination of unprecedented flexibility as well as old and new forms of rigidity

a search based theory of the on the run phenomenon we propose a model in which assets with identical cash flows can trade at different prices infinitely lived agents can establish long positions in a search spot market or short positions by first borrowing an asset in a search repo market we show that short sellers can endogenously concentrate in one asset because of search externalities and the constraint that they must deliver the asset they borrowed that asset enjoys greater liquidity a higher lending fee specialness and trades at a premium consistent with no arbitrage we derive closed form solutions for small frictions and provide a calibration generating realistic on the run premia

real wages over the business cycle evidence from panel data one topic on which keynes did not disagree with classical economists was the cyclical behavior of real wages keynes 1936 as well as various classical writers predicted that real wages should move countercyclically quoting the general theory p 17 in general an increase in employment can only occur through the accompaniment of a decline in real wages thus i am not disputing this vital fact which the classical economists have rightly asserted as indefeasible this prediction is based on the premise of competition and a given short run capital stock increases in employment then correspond to more intensive use of capital and through diminishing product lower real wages for this reason evidence by dunlop 1938 and tarshis 1939 that real wages move procyclically was viewed as paradoxical both dunlop and tarshis based their findings on an observed positive correlation between real and money wages which given the procyclical movement of money wages implies a positive correlation between

business cycle models aggregation and real wage cyclicality a substantial literature has developed to estimate the true cyclicality of real wages that is composition bias free two major issues are addressed in this article aggregation of heterogeneous workers and potential bias in the measurement of the labor input a general analysis of the biases is presented and alternative approaches in the literature are nested in a single framework estimates based on an efficiency units concept that avoids the usual aggregation problems are presented composition bias underestimates the usual parameters of interest unless both the price and the quantity of the labor input are adjusted appropriately

wage flexibility in the chinese labour market 1989 2009 abstractwage flexibility in the chinese labour market 1989 2009 regional studies china s bureaucratic wage determination system is gradually being replaced by a market based system leading to a novel version of a dual labour market this paper studies wage flexibility in this dual market its principal findings are as follows wages in both sectors have become less responsive to changes in official registered unemployment with an alternative market based measure of unemployment becoming more relevant there is evidence of convergence of flexibility between the two sectors the wages of women exhibit greater flexibility than those of men and there is evidence of differences in wage flexibility between workers who have urban residential rights and rural migrants

pro poor agricultural biotechnology can the international research system deliver the goods abstract while global investment in agricultural research by the private sector is increasing with growth in developing country markets and the emergence of new technologies complementary public sector investment is stagnating or declining in many developing countries this review argues that the changing roles of the public and private sectors in generating new scientific knowledge may adversely affect the diffusion of explicitly pro poor technologies technologies that are simultaneously yield enhancing and poverty reducing comparing historical evidence from the green revolution with recent evidence from the emerging era of agricultural biotechnology this review argues that a more pluralistic international system for agricultural research will be more responsive to poverty only if the strategic leadership role of the public sector is strengthened certain research functions are reallocated to the private sector and new policy and organizational mechanisms are used to stimulate pro poor research in and for developing country agriculture

the effect of environmental regulation on optimal plant size and factor shares the method for measuring the effects of environmental regulation on the size distribution of industrial plants and the distribution of factor shares described in this paper focuses on the 20 industries with highest per unit pollution abatement costs and the 20 with the lowest costs the study finds that compliance with environmental laws has not only reduced the number of plants in the affected industries but has placed a greater burden on small rather than on large plants besides redistributing within industry market shares environmental regulation has increased the use of capital relative to labor although the disproportionate burden placed on small plants in the high abatement cost industries may have been unintended it is likely that large firms will be less vocal opponents of environmental regulation than are small firms 22 references 12 tables

reform without losers an interpretation of china s dual track approach to transition this paper develops a simple model to analyze the dual track approach to market liberalization as a mechanism for implementing efficient pareto improving economic reform that is reform achieving efficiency without creating losers the approach based on the continued enforcement of the existing plan while simultaneously liberalizing the market can be understood as a method for making implicit lump sum transfers to compensate potential losers of the reform the model highlights the critical roles of enforcement of the plan for achieving pareto improvement and full liberalization of the market track for achieving efficiency we examine how the dual track approach has worked in product and labor market liberalization in china

tax effects in term structure estimation this study is a refinement and an extension of an earlier study by mcculloch of tax effects in the regression equation for term structure estimation this study includes tests for tax effects and heteroskedasticity a reconsideration of the need for an instrumental variable and a search for the capital gains tax rate in addition to the ordinary income tax rate there are two major findings 1 statistically significant taxinduced bias in the non tax adjusted equation and 2 evidence that the capital gains tax is misspecified in the tax adjusted equation it is well known e g see 4 2 pp 727 30 and 25 that the yield curve is an imperfect surrogate for the term structure of interest rates and various methods have been developed to estimate the term structure directly by regressing prices on payments in a sample of default free securities 1 since investors are concerned with the after tax payments on securities it is desirable to incorporate tax effects in term structure estimation mcculloch 22 and schaefer 26 29 have employed different approaches to the tax effect problem mcculloch employed the regression approach and searched for a single tax rate

wage flexibility in regional labour markets evidence from italy and germany ammermuller a lucifora c origo f and zwick t wage flexibility in regional labour markets evidence from italy and germany regional studies this paper investigates the functioning of regional labour markets in italy and germany for different employee groups and regions it derives theoretical hypotheses on group specific correlations between regional unemployment and individual wages distinguishing between regions using micro data matched to local unemployment rates wage equations are specified and empirically tested for italy no evidence is found in favour of a relationship between wages and local unemployment in germany results appear to be sensitive to model specification and type of employees in both countries the reaction of wages to local unemployment varies significantly along the wage distribution being more sensitive around median quantiles ammermuller a lucifora c origo f et zwick t la flexibilite des salaires dans les marches du travail regionaux des preuves provenant de

litigation and settlement an empirical approach litigants in civil lawsuits involving monetary damages often find an out of court settlement preferable to a trial most theoretical models of settlement choice employ an expected utility maximizing framework that emphasizes the importance of risk preferences litigation costs and the distribution of trial awards an empirical model of settlement choice is used to examine whether the variables prominent in the theoretical literature are statistically useful in explaining the occurrence and monetary value of settlements estimates from a sample of civil filings provide new empirical evidence of how the legal system affects the behavior of litigants during the settlement process copyright 1989 by mit press

negative nominal interest rates and the liquidity premium abstract this paper investigates the phenomenon whereby the most recently issued on the run us treasury bond is more heavily traded and thereby accrues a liquidity premium this premium is shown to be related to the time the asset will remain heavily traded and sufficient to cause negative forward nominal interest rates when compared with the prices of similar less liquid bonds

are larger treasury issues more liquid evidence from bill reopenings this paper makes use of a natural experiment of the u s treasury department to examine the relationship between treasury security issue size and liquidity treasury bills that were first issued with 52 weeks to maturity and then reopened at 26 weeks are shown to be more liquid than comparable maturity bills that were first issued with 26 weeks to maturity the relationship is less pronounced when bills are on the run the most recently auctioned bills of a given maturity than when they are off the run and persists when controlling for other factors that affect liquidity the reopened bills are found to have higher yields lower prices than comparable maturity bills showing that the indirect liquidity benefits of reopenings are more than offset by the direct supply costs

the settlement of patent litigation in this article i develop a model to analyze patent licensing that is induced as part of a settlement agreement to avoid litigation of the issue of patent validity the patentee possesses private information about patent validity and makes a take it or leave it settlement offer to a single potential rival an essentially unique sequential equilibrium exists if out of equilibrium beliefs are restricted appropriately the model analyzes the effect of the probability of settlement and litigation

negative option values are possible the impact of treasury bond futures on the cash u s treasury market abstract this paper uses a unique financial instrument in the u s treasury market to study the price behavior of the put option embedded in the november 2009 14 callable u s treasury bond we find that beginning in august 1993 the estimated option value was persistently negative on nearly every day for the ensuing eight months we show that the anomalous pricing behavior arose because the underlying callable bond became the cheapest to deliver issue against u s treasury bond futures contracts hence this paper provides direct evidence that derivative assets can significantly distort pricing in the primary asset market

the costs of inefficient bargaining and financial distress abstract this study provides the first large sample analysis of the stock market reactions to interfirm litigation when a suit is filed the common stock of the typical defendant declines by about 1 while the plaintiff experiences no significant gains for the average pair of firms the combined drop in value upon filing is 21 million much of the loss is regained if the suit is settled the findings suggest that bargaining among firm claimants sometimes leads to very inefficient outcomes part of the leakage is explained by the costs of increased financial distress imposed on the defendant

the dynamics of financially constrained arbitrage we develop a model of financially constrained arbitrage and use it to study the dynamics of arbitrage capital liquidity and asset prices arbitrageurs exploit price discrepancies between assets traded in segmented markets and in doing so provide liquidity to investors a collateral constraint limits their positions as a function of capital we show that the dynamics of arbitrage activity are self correcting following a shock that depletes arbitrage capital profitability increases and this allows capital to be gradually replenished spreads increase more and recover faster for more volatile trades although arbitrageurs cut their positions in these trades the least when arbitrage capital is more mobile across markets liquidity in each market generally becomes less volatile but the reverse may hold for aggregate liquidity because of mobility induced contagion

limits to arbitrage and the term structure of bond illiquidity premiums abstract theoretical models suggest that the relation of speculators capital and market liquidity is highly nonlinear changes in capital only marginally affect liquidity when capital is available abundantly but have a large effect when capital is scarce in this paper we confirm this relation within a regime switching model using three broad measures of german bond market liquidity we then analyze how the term structure of illiquidity premiums of german agency bonds is related to intermediaries capital and foreign flows illiquidity premiums are related to both variables only in the stress regime the effect of intermediaries capital is most strongly pronounced at the short end of the term structure in contrast flows into and out of the illiquid bond market segment constitute a level effect as they are related to illiquidity premiums of all maturities

the wage curve a review in the wage qurve david g blancflower and andrew j oswald argue that there is a fundamental negative relation between wages and the unemployment rate in a worker s local labor market blancflower and oswald use large scale micro data sets to estimate this relation for the united states britain and 10 other countries i review their empirical methods and findings and provide some further evidence on the nature of the wage curve relationship in the united states i conclude that there is a strong statistical correlation between rates of pay and local unemployment although the interpretation of this correlation remains unresolved this abstract was borrowed from another version of this item

patents and cumulative innovation causal evidence from the courts cumulative innovation is central to economic growth do patent rights facilitate or impede such follow on innovation this paper studies the effect of removing patent protection through court invalidation on the subsequent research related to the focal patent as measured by later citations we exploit random allocation of judges at the u s court of appeal for the federal circuit to control for the endogeneity of patent invalidation we find that patent invalidation leads to a 50 percent increase in subsequent citations to the focal patent on average but the impact is highly heterogeneous patent rights appear to block follow on innovation only in the technology fields of computers electronics and medical instruments moreover the effect is entirely driven by invalidation of patents owned by large patentees that triggers entry of small innovators suggesting that patents may impede the democratization of innovation

welfare impacts of cross country spillovers in agricultural research the welfare implications of intellectual property protection ipp for private sector agricultural research are analyzed focusing on the realistic cases where countries provide different ipp levels technology spills over across countries and the public sector is involved in research a model is developed to determine who benefits from and who should pay for the associated research the article contains some interesting results on the implications of a harmonization of ipp policies through multilateral agreements or via technology that allows research firms to prevent the copying of plants and animals that express traits that have emerged from their research

regulation and firm size fda impacts on innovation this article estimates the highly differential impacts of fda regulations on pharmaceutical firms of various sizes where size is measured as scale of r d expenditures estimation is performed using the method of maximum quasi likelihoods using productivity trends of the united kingdom as a control to isolate fda regulatory effects in the united states it is shown that smaller u s pharmaceutical firms suffered devastating reductions in research productivity because of fda regulations in contrast the largest u s pharmaceutical firms apparently benefited from regulation as sales gains due to reduced competition more than offset their quite moderate declines in research productivity

cooperation harassment and involuntary unemployment an insider outsider approach the authors present a theory of involuntary unemployment which explains why the unemployed workers outsiders are unable or unwilling to find jobs even though they are prepared to work for less than the prevailing wages of incumbent workers in siders the outsiders do not underbid the insiders since were the y to do so the insiders would withdraw cooperation from them making their work unpleasant with harassment and thereby reducing the prod uctivity and increasing the reservation wages of the underbidders th e resulting labor turnover costs create economic rent which the insid ers tap in wage setting and as a result involuntary unemployment ma y arise copyright 1988 by american economic association

real wage cyclicality of job stayers within company job movers and between company job movers using the british new earnings survey panel data nespd for the period 1975 to 2001 we estimate the wage cyclicality of job stayers those remaining within single jobs in a given company within company job movers and between company job movers we also examine how the proportion of internal and external job moves varies over the business cycle we find that the wages of internal movers are slightly more procyclical and wages of external movers considerably more procyclical than those of stayers notwithstanding a decomposition shows that in britain wage cyclicality arises almost entirely from the procyclicality of wages for job stayers with across and within firm mobility playing a lesser role thus there is little evidence for rigid wage models that imply that employers use changes in job titles as a means of adjusting wages to the business cycle we also show that the distinctions between private and public sectors and between workers covered and uncovered by collective agreements have important impacts on the wage estimates of both stayers and movers

what is behind the recent surge in patenting abstract we investigate the cause of an unprecedented surge of us patenting over the past decade conventional wisdom points to the establishment of the court of appeals of the federal circuit by congress in 1982 we examine whether this institutional change which has benefited patent holders explains the burst in us patenting using both international and domestic data on patent applications and awards we conclude that the evidence is not favorable to the conventional view instead it appears that the jump in patenting reflects an increase in us innovation spurred by changes in the management of research

tax induced clientele effects in the market for british government securities abstract this paper develops a new methods for measuring tax effects in bond markets and presents empirical results for british government securities the basic idea is to construct a least cost portfolio which for investors in a given tax bracket dominates a given bond a portfolio is said to dominate a bond if it provides cash flows which are at least as great in every period and has a lower price in effect our method calculates an upper bound on the value of a bond to investors in a given tax bracket the results demonstrate i the existence of clientele effects and ii the absence of an effective tax rate

the cyclicality of real wages within employer employee matches using data from the panel study of income dynamics the author examines the cyclicality of wages within employer employee matches for the years 1970 91 recent research on wage cyclicality has suggested that wages are very procyclical tending to rise and fall with economic upturns and downturns even for workers who remain with the same employer the author finds however that the evidence for wage procyclicality within the matches he examines is rather weak except for the small group of workers who were paid by piece rate or commissions despite having acyclical wage rates men who were paid hourly had earnings movements that were very procyclical salaries exhibited little cyclicality but salaried workers who had income sources from bonuses commissions or overtime had procyclical earnings the results suggest that the increasing prevalence of incentive based pay will increase the procyclicality of wages within matches

liquidity premia in dynamic bargaining markets abstract this paper develops a search theoretic model of the cross sectional distribution of asset returns abstracting from risk premia and focusing exclusively on liquidity in contrast with much of the transaction cost literature it is not assumed that different assets carry different exogenously specified trading costs instead different expected returns due to liquidity are explained by the cross sectional variation in tradeable shares the qualitative predictions of the model are consistent with much of the empirical evidence

primary versus secondary pricing of high yield bonds previous research has found systematic underpricing of newly floated securities vis a vis secondary market levels this conclusion is based on the observation that primary issues provide superior risk adjusted returns in the period immediately following issuance those returns however are not known at the time of pricing to gauge whether a new issue is offered at a premium or a concession to the secondary market investors must use standard valuation benchmarks in the case of high yield bonds an analysis based on agency ratings and yields to maturity indicates that new issues are priced richer than seasoned issues in some periods and cheaper in other periods using regression analysis the authors model the magnitude of the premium or concession prevailing in a given period the regressions explain 64 percent of the variance in the primary secondary yield spread through proxies for supply demand and liquidity of the high yield sector

the cost of short selling liquid securities standard models of liquidity argue that the higher price for a liquid security reflects the future benefits that long investors expect to receive we show that short sellers can also pay a net liquidity premium if their cost to borrow the security is higher than the price premium they collect from selling it we provide a model free decomposition of the price premium for liquid securities into the net premiums paid by both long investors and short sellers empirically we find that short sellers were responsible for a substantial fraction of the liquidity premium for on the run treasuries from november 1995 through july 2009

price informativeness and predictability how liquidity can help information asymmetry and liquidity concentration has been widely discussed in literatures this study shows how liquidity influences not only forecasting performances of term structure estimation but also information transmission and price adjustment across markets our analysis helps understanding how extreme market movements affect one another this study examines and provides a rationale for incorporating liquidity in estimating term structure forecasting performance can be greatly enhanced when conditioning on trading liquidity it reduces information asymmetry in the sense of easley and o hara 2004 and burlacu et al 2007 we adopt a time series forecasting model following diebold and li 2006 to compare behaviour of forecasted price errors our findings indicate that forecasted price errors in markets with less depth would influence those with more information asymmetry induces volatile trading first and then price adjustment is transmitted to another market due to insufficient market dep

does urgency affect price at market an analysis of u s treasury short term finance like all economic agents government must actively manage its cash position in order to meet obligations in the u s when the short term cash position is not adequate treasury offers bills that are not previously scheduled cash management bills using data from treasury s proprietary domestic finance database this paper finds unscheduled bills have consistently higher yields than normally scheduled bills suggesting the more inelastic demand represented by this type of finance has an impact on costs several factors are identified which contribute to the costs of cash management for treasury

litigation liability and incentives for care abstract in this paper potential injurers are subject to a negligence standard and differ in cost of taking care in the event of accident the injurer s degree of care is private information in litigation that follows award of damages for pain and suffering will lead to a general increase in care and hence reduce the likehood of accident a tighter negligence standard will lead some potential injurers to take more care and others to take less adoption of a rule under which the loser at trial must pay the litigation costs of the winner will reduce the pressure for punitive damages

how does liquidity affect government bond yields the paper explores the determinants of yield differentials between sovereign bonds using euro area data there is a common trend in yield differentials which is correlated with a measure of aggregate risk in contrast liquidity differentials display sizeable heterogeneity and no common factor we propose a simple model with endogenous liquidity demand where a bond s liquidity premium depends both on its transaction cost and on investment opportunities the model predicts that yield differentials should increase in both liquidity and risk with an interaction term of the opposite sign testing these predictions on daily data we find that the aggregate risk factor is consistently priced liquidity differentials are priced for a subset of countries and their interaction with the risk factor is in line with the model s prediction and crucial to detect their effect

an option perspective on generating and maintaining plant variety rights in china notwithstanding the ambiguous research and productivity promoting effects of plant variety protections pvps even in developed countries many developing countries have adopted pvps in the past few years in part to comply with their trade related aspects of intellectual property rights trips obligations seeking and maintaining pvps reserves options to an expected revenue stream from the future sale of protected varieties the value of which varies for a host of reasons in this article we empirically examine the pattern of pvp applications in china since its pvp laws were first introduced in 1997 we place those pvp rights in the context of china s present and likely future seed markets to identify the economic incentives and institutional influences on decisions to develop and apply for varietal rights

intellectual property rights and the world trade organization retrospect and prospects this paper analyzes the main economic issues of intellectual property rights iprs protection in the context of the world trade organization wto a retrospective view on the establishment of the trips trade related aspects of intellectual property rights agreement a still controversial accomplishment of the uruguay round of trade liberalization is provided the paper reviews the economic rationale for the harmonization of iprs drawing both on economic theory considerations as well as emerging empirical evidence the logic of linking ipr protection and trade in the context of the wto is also re examined some specific attention is devoted to the implications of trips for agricultural and biotechnology innovations the impact that ipr protection can have in promoting growth and development and the relation of iprs with other economic policies is discussed the paper concludes with an analysis of the prospects for more or less iprs related consensus in the current round of wto negotiations

secondary trading costs in the municipal bond market using new econometric methods we separately estimate average transaction costs for over 167 000 bonds from a 1 year sample of all u s municipal bond trades municipal bond transaction costs decrease with trade size and do not depend significantly on trade frequency also municipal bond trades are substantially more expensive than similar sized equity trades we attribute these results to the lack of bond market price transparency additional cross sectional analyses show that bond trading costs increase with credit risk instrument complexity time to maturity and time since issuance investors and perhaps ultimately issuers might benefit if issuers issued simpler bonds

liquidity taxes and short term treasury yields this article investigates differences in yields on identical treasury notes and bills and shows that they reflect differences in liquidity immediacy risk and taxes it proposes an empirical measure for differences in the liquidity risk of notes and bills the volatility ofthe underlying rate times the ratio of bills turnover to notes turnover because differential taxes affect sellers but not buyers of bills and notes the results reject free of informational problems the hypothesis that the notes demand curve is horizontal note bill yield differences also decrease with inventories of notes the less liquid asset

bond returns liquidity and missing data this paper examines holding period returns to constant duration portfolios of u s govern ment notes and bonds and measures the return premium generated by liquidity differences in bonds the approach compares constant duration portfolios constructed in two distinct ways one using only bonds issued in the most recent treasury auction one using all other bonds comparisons of the resulting series are made meaningful by choosing narrow du ration ranges in the portfolio formation procedure this in turn induces a missing data problem in the created time series parameters of return distributions are therefore estimated employing a maximum likelihood framework that explicitly accounts for the missing data it is estimated that recently issued bonds are priced to return a premium of around 55 basis points per annum over otherwise equivalent instruments

the decline in idiosyncratic values of us treasury securities abstract unique features and market frictions can lead to idiosyncratic pricing for some us treasury securities this study uses a linear programming lp model to measure aggregate idiosyncratic pricing of t notes and t bonds from 1980 to 2016 we document an average idiosyncratic pricing of 0 11 per 100 par as compared to an average bid ask spread of 0 08 further idiosyncratic pricing declined dramatically from the early 1980s to the 2010s empirical evidence suggests that the 1986 tax reform act increasing issue sizes and improving market liquidity contribute to the decline at the individual security level we identify factors contributing to and mitigating idiosyncratic pricing

does the liquidity of a debt issue increase with its size evidence from the corporate bond and medium term note markets to investigate the liquidity of large issues this study tests for yield differences between corporate bonds and medium term notes mtns in the sample mtns have an average issue size of 4 million compared with 265 million for bonds among mtns that have the same issuance date the same maturity date and the same corporate issuer we find no relation between size and yields moreover bonds and mtns have statistically equivalent yields thus rather than suggesting that large issues have greater liquidity these findings indicate that large and small securities issued by the same borrower are close substitutes the objective of this study is to test for a relation between the size of corporate debt offerings and their yields if investors value large offerings for their greater liquidity then large issues will have lower yields than small issues alternatively if investors view securities of the same borrower as close substitutes there may be no relation between issue size and yields to investigate whether issue size is a significant determinant of liquidity we test for yield differences between medium term notes mtns and bonds of the same corporate issuers in most respects mtns are similar to corporate bonds however mtns have an average issue size of around 5 million in contrast most offerings in the bond market raise at least 100 million thus if liquidity increases with issue size bonds will have lower yields than mtns and large mtns will have lower yields than small mtns the data we use consist of 4 182 mtns and 68 bonds offered by four large borrowers between october 1987 and december 1992 the issues in the sample range in size from 102 000 to 1 2 billion a disperse distribution that allows us to make reliable inferences about the relation between issue size and yields to test for a size effect within the mtn market we create subsamples of mtns that have the same issuance date the same maturity date and the same corporate issuer mtns in these subsamples are identical except for their yields and size on average yields on large mtns in the subsamples are 0 35 basis point higher than yields on small mtns a finding that is inconsistent with the liquidity hypothesis we also test for a yield difference between bonds

the on the run liquidity phenomenon abstract we test the implications of a model of multi asset speculative trading in which liquidity differentials between on the run and off the run u s treasury bonds ensue from endowment shocks in the presence of two realistic market frictions information heterogeneity and imperfect competition among informed traders and a public signal our evidence suggests that i off on the run liquidity differentials are economically and statistically significant even after controlling for several of the bonds intrinsic characteristics such as duration convexity repo rates or term premiums and ii off on the run liquidity differentials are smaller immediately following bond auction dates and larger when the uncertainty surrounding the ensuing auction allocations is high when the dispersion of beliefs across informed traders is high and when macroeconomic announcements are noisy consistent with our model

a new linear programming approach to bond portfolio management this paper derives and tests a new linear programming lp approach to bond portfolio management the model elicits possible tax clientele effects in the pricing of u s gov ernment coupon bonds and simultaneously derives the optimal tax specific bond portfolio analytically the model derives these results by exploiting for a given tax bracket the price differential of an after tax stream of cash flows it accomplishes this objective by purchasing at the ask price underprieed bonds for the specific tax bracket while sim ultaneously selling at the bid price overpriced bonds the model requires that the net cash flow inclusive of purchased and sold bonds be nonnegative at all future dates the problem s formulation standardizes the position taken in each bond to a maximum of one unit one of the model s appealing features is the parsimonious number of required calcu lations only one lp program need be run per tax bracket in addition to obtaining an optimally chosen tax specific bond portfolio the model also measures the after tax term structure of spot u s government interest rates for both tax exempt and taxable investors finally the superior monthly holding period rates of return on the optimal taxspecific bond portfolio demonstrate an important property ofthe model s output

the term structure of bond liquidity we analyze the impact of market frictions on the trading volume and liquidity premia of finite maturity assets when investors differ in their trading needs our equilibrium model generates a clientele effect frequently trading investors hold only short term assets and predicts i a hump shaped relation between trading volume and maturity ii lower trading volumes of older compared with younger assets iii an increasing liquidity term structure from ask prices iv a decreasing or u shaped liquidity term structure from bid prices and v spillovers of liquidity from short term to long term maturities empirical tests for u s corporate bonds support our theoretical predictions

measuring wage flexibility the case of turkey before and after structural adjustment this article presents an empirical analysis of wage flexibility in the formal private sector in turkey the analysis is based on a wage bargaining model that links the nominal wage demands to labour market conditions which are proxied by the rate of unemployment productivity improvements and price expectations the model is estimated on the basis of panel data of the formal private manufacturing industry and changes in the wage setting mechanism as the country shifts from an import substituting industrialization strategy to an export oriented growth regime are discussed this debate is particularly important in terms of its policy implications and is relevant to current international discussions of the role of labour markets during structural adjustment in most economic policy discussions unemployment is assumed to be a labour market rigidity problem the results of this article however suggest that increased flexibility of wages leaves little room for such arguments in the light of these findings the prospect of wage rigidity becomes immaterial and a focus on the structural problems of the economy which are outside the labour market becomes central

the economics of product patents this paper develops a model of product patents in which the patent changes the nature of market entry behavior rather than preventing entry entirely the model incorporates three levels of action namely the innovator s patenting decision the potential entrant s location decision and possible court action the analysis demonstrates how the characteristics of the patents system and the enforcement framework can influence rivals variety choices and thus the market equilibrium it also considers how the system can in principle be adjusted to improve social welfare copyright 1990 by american economic association

supplying crop biotechnology to the poor opportunities and constraints abstract unlike the public sector research that launched the green revolution private firms based in industrialised countries have done the majority of agricultural biotechnology research and almost all commercialisation of genetically modified gm crops this paper examines consequences of the emergence of a few large companies as leaders in the commercialisation of biotechnology by addressing issues of access to technology costs of conducting research and distribution of economic benefits to provide context we first review the status of crop biotechnology research globally who is benefiting from the technology we then analyse the role of intellectual property rights market access and industry concentration public sector research and gm crop biosafety regulations in determining observed r d by firms the paper recommends policy measures that allow transfer of current technology to the poor and generate more biotechnology research focused on problems of the poor

the administrative costs of corporate bankruptcy a note in this paper we present evidence on the direct administrative costs of corporate bankruptcy the investigation is directed toward providing evidence that may be helpful in answering questions about the role of bankruptcy costs as a determinant of corporate capital structures the importance of bankruptcy costs as a determinant of corporate financing policy has been extensively debated in the finance literature the origins of the debate can be traced to modigliani and miller 8 and robichek and myers 9 under the assumption that debt is default free and interest payments are taxdeductible modigliani and miller demonstrated that firms will maximize their market values by maximizing their use of debt financing robichek and myers demonstrated that this conclusion also holds when debt is not default free but bankruptcy is costless to explain observed corporate debt to total value ratios which typically fall in the range of 20 percent to 30 percent robichek and myers 9 and baxter 1 appealed to the existence of bankruptcy costs as a possible counterweight to the tax deductibility of interest payments subsequently kraus and litzenberger 5 scott 10 lee and barker 6 kim 4 and turnbull 13 developed formal models in which firms maximize value by increasing their use of debt financing to the point where the marginal present value of future tax shields equals the marginal present value of future bankruptcy costs the bankruptcy cost literature has identified three types of costs as potentially relevant to the determination of a firm s optimal mix of debt and equity financing 1 the direct administrative expenses paid to various third parties involved in the bankruptcy proceedings 2 the shortfall in realized value when assets are sold in liquidation or the indirect costs of reorganization and 3 the loss of tax credits which the firm would have received had it not gone bankrupt contrarily haugen and senbet 3 and to a lesser extent miller 7 and warner 14 have argued that the only bankruptcy costs relevant to the determination of a firm s optimal capital structure are the direct administrative costs of bankruptcy the crux of their argument is that the shortfall costs of liquidation the indirect costs of reorganization and the loss of tax credits which occurs upon dissolution of the firm are in fact relevant to the liquidation investment decisions of the firm these costs would be borne by the security holders of a failing firm

patent enforcement a review of the literature without the confidence that patent rights can be enforced quickly and efficiently when needed the patent system will not stimulate innovation for this reason governments academics international institutions and the private sector have poured significant resources into gathering and analysing statistics on patent enforcement over the last two decades this paper reviews these studies and finds that while infringement is relatively common much enforcement occurs informally and less than 1 2 of patents incur litigation new strategic uses of the enforcement system especially by nonpracticing entities are the major emerging enforcement issue especially in the united states while the old problem of litigation costs attracts the lion s share of empirical attention it has produced remarkably few solutions to date

standard errors in event studies even if true abnormal returns are uncorrelated estimated abnormal returns are not this paper presents a simple formula for the variance of estimated cumulative abnormal re turns both returns and dummy variable procedures for estimating the standard error correctly taking account of both intertemporal and contemporaneous correlation of esti mated residuals are discussed they are then applied to an event study of post merger performance it is shown that ignoring either the intertemporal or contemporaneous correlation of residuals can result in significant underestimates of standard errors

efficiency wage models of unemployment keynesian economists hold it to be self evident that business cycles are characterized by involuntary unemployment but construction of a model of the cycle with involuntary unemployment faces the obvious difficulty of explaining why the labor market does not clear involuntarily unemployed people by definition want to work at less than the going wage rate why don t firms cut wages thereby increasing profits

the german wage curve evidence from the iab employment sample abstract this paper examines the german wage curve using the institut fur arbeitsmarkt und berufsforschung iab employment sample over the period 1981 1990 a random sample of 6590 employees covering 142 labor market regions over a ten year period is considered the total number of observations is 40 852 taking into account the endogeneity of unemployment as well as controlling for region and time effects this paper finds support for the wage curve in germany the overall unemployment elasticity estimate is 0 07 and is higher for younger workers than older workers the wages of less qualified workers are more responsive to local unemployment rates than the wages of more qualified workers also the wages of men are slightly more responsive to local unemployment rates than the wages of women ignoring endogeneity of the local unemployment rate yields results in favor of the wage curve only for younger and less qualified workers accounting for endogeneity of the unemployment rate yields evidence in favor of the wage curve across all types of workers

product liability research and development and innovation product liability ideally should promote efficient levels of product safety but misdirected liability efforts may depress beneficial innovations this paper examines these competing effects of liability costs on product r d intensity and new product introductions by manufacturing firms at low to moderate levels of expected liability costs there is a positive effect of liability costs on product innovation at very high levels of liability costs the effect is negative at the sample mean liability costs increase r d intensity by 15 percent the greater linkage of these effects to product r d rather than process r d is consistent with the increased prominence of the design defect doctrine

default risk cannot explain the muni puzzle evidence from municipal bonds that are secured by u s treasury obligations fama 1977 and miller 1977 predict that one minus the corporate tax rate will equate after tax yields from comparable taxable and tax exempt bonds empirical evidence shows that long term tax exempt yields are higher than theory predicts two popular explanations for this empirical puzzle are that relative to taxable bonds municipal bonds bear more default risk and include costly call options i study u s government secured municipal bond yields which are effectively default free and nonmalleable these municipal yields display the same tendency to be too high i conclude that differential default risk and call options do not explain the municipal bond puzzle article published by oxford university press on behalf of the society for financial studies in its journal the review of financial studies

spanish treasury bond market liquidity and volatility pre and post european monetary union abstract spain enacted a number of important debt management initiatives in 1997 to prepare its treasury bond market for european monetary union we interpret the impacts of these changes through shifts in a bond liquidity life cycle function furthermore we highlight the importance of expected average future liquidity in explaining spanish bond liquidity premiums we also uncover pricing biases that support the spanish treasury s tactical decision to target high coupon premium bonds in its pre emu debt exchanges finally we show that emu has been associated with both a decrease in bond yield volatility and an increase in pricing efficiency

stock and bond market liquidity a long run empirical analysis this paper establishes liquidity linkage between stock and treasury bond markets there is a lead lag relationship between illiquidity of the two markets and bidirectional granger causality the effect of stock illiquidity on bond illiquidity is consistent with flight toquality or flight to liquidity episodes monetary policy impacts illiquidity the evidence indicates that bond illiquidity acts as a channel through which monetary policy shocks are transferred into the stock market these effects are observed across illiquidity of bonds of different maturities and are especially pronounced for illiquidity of short term maturities the paper provides evidence of illiquidity integration between stock and bond markets

south north trade intellectual property jurisdictions and freedom to operate in agricultural research on staple crops international food policy research institute washington d c center for the application of molecular biology to international agriculture canberra university of california berkeley the authors are listed alphabetically philip pardey is a senior research fellow and patricia zambrano a senior research assistant at the international food policy research institute carol nottenburg is director of intellectual property at the center for the application of molecular biology to international agriculture and brian wright is a professor and eran binenbaum a ph d student in the department of agricultural and resource economics university of california berkeley stephen stohs bonwoo koo and yuan liang provided excellent research assistance and agapi somwaru usda ers collaborated with us in compiling the trade data richard jefferson provided invaluable comments on earlier drafts research for this paper was made possible in part by a grant from the swedish international development agency sida

corporate bond market transaction costs and transparency using a complete record of u s over the counter otc secondary trades in corporate bonds we estimate average transaction costs as a function of trade size for each bond that traded more than nine times between january 2003 and january 2005 we find that transaction costs decrease significantly with trade size highly rated bonds recently issued bonds and bonds close to maturity have lower transaction costs than do other bonds costs are lower for bonds with transparent trade prices and they drop when the trace system starts to publicly disseminate their prices the results suggest that public traders benefit significantly from price transparency

recent developments in intellectual property and power in the private sector related to food and agriculture the legal protection of intellectual property ip has allowed private persons and enterprises to assert exclusive rights in relation to certain agricultural innovations whether through the protection of breeding innovations under plant variety rights protection laws or through the patenting of genes and gene fragments the increasing involvement of iprs in agriculture has effected a shift of agricultural research from public to private institutions this article examines the changes in the international ip landscape which has facilitated these developments and looks at the impacts of modern ip developments upon agricultural research and farmers it concludes with a consideration of ip liability issues arising from the development of gm agriculture