agricultural price instability a survey of competing explanations and remedies there are two explanations for agricultural price dynamics one follows cobweb logic and models fluctuations driven by expectation errors but emphasises that these expectations create complex dynamics and possibly chaos the other stems from the rational expectations tradition of dynamics driven by real shocks the empirical evidence tends to support the latter but is not conclusive the rational expectations model generates an optimal dynamic path from which no improvement can be expected from public intervention however if we take account of all the potential market failures in agricultural markets and especially in developing countries this conclusion might require some qualifications although an appropriate policy design for stability has still to be achieved this paper surveys the positive and normative literature on agricultural prices highlighting empirical evidence and identifying remaining unresolved issues

optimal capital income taxation with incomplete markets borrowing constraints and constant discounting for a wide class of infinitely lived agent models chamley has shown that the optimal capital income tax rate is zero in the long run lucas has argued that for the u s economy there is a significant welfare gain from switching to this policy this paper shows that for the bewley class of models with incomplete insurance markets and borrowing constraints the optimal tax rate on capital income is positive even in the long run therefore cutting the capital income tax to zero may well lead to welfare losses

international spillovers of large scale asset purchases this paper evaluates the international spillover eects of large scale asset purchases lsaps using a two country dynamic stochastic general equilibrium model with nominal and real rigidities and portfolio balance eects portfolio balance eects arise from imperfect substitution between short and long term bond portfolios in each country as well as between domestic and foreign bonds within these portfolios we show that lsaps lower both domestic and foreign long term yields and stimulate economic activity in both countries international spillover eects

estimation of dynamic nonlinear rational expectations models of primary commodity markets with stochastic dynamic programming and disequilibrium maximum likelihood methods are combined to estimate a dynamic nonlinear rational expectations model of a market for a storable primary commodity the estimation model captures the inherently nonlinear structure of private stockholding dynamics the disequilibrium effects of government buffer stock intervention and the impact of price expectations and risk on private supply and stockholding decisions copyright 1993 by mit press

the optimum quantity of debt abstract we find that the welfare gains to being at the optimum quantity of debt rather than the current us level are small and therefore concerns regarding the high level of debt in the us economy may be misplaced this finding is based on a model of a large number of infinitely lived households whose saving behavior is influenced by precautionary saving motives and borrowing constraints this model incorporates a different role for government debt than is found in standard models and it captures different cost benefit trade offs on the benefit side government debt enhances the liquidity of households by providing an additional means of smoothing consumption and by effectively loosening borrowing constraints on the cost side the implied taxes have adverse wealth distribution and incentive effects in addition government debt crowds out capital via higher interest rates and lowers per capita consumption

macroeconomics and the term structure this paper provides an overview of the analysis of the term structure of interest rates with a special emphasis on recent developments at the intersection of macroeconomics and finance the topic is important to investors and also to policymakers who wish to extract macroeconomic expectations from longer term interest rates and take actions to influence those rates the simplest model of the term structure is the expectations hypothesis which posits that long term interest rates are expectations of future aver age short term rates in this paper we show that many features of the configuration of interest rates are puzzling from the perspective of the expectations hypothesis we review models that explain these anomalies using time varying risk premia although the quest for the fundamental macroeconomic explanations of these risk premia is ongoing inflation uncertainty seems to play a large role finally while modern finance theory prices bonds and other assets in a single unified framework we also consider an earlier approach based on segmented markets market segmentation seems important to understand the term structure of interest rates during the recent financial crisis jel e31 e43 e52 e58

government debt management the long and the short of it standard optimal debt management dm models prescribe a dominant role for long bonds and advocate against issuing short bonds they require very large positions in order to complete markets and assume each period that governments repurchase all outstanding bonds and reissue r r new ones these features of dm are inconsistent with u s data we introduce incomplete markets via small transaction costs which serves to make optimal dm more closely resemble the data r r are negligible short bond issuance substantial and persistent and short and long bonds positively co vary intuitively long bonds help smooth taxes over states and short bonds over time solving incomplete market models with multiple assets is challenging so a further contribution of this article is introducing a novel computational method to find global solutions

the effects of commodity price stabilization programs in this paper the authors analyze the effects of commodity programs in which the government attempts to support and stabilize price through open market purchases and sales specifically they as sess the effects of such programs on the u s soybean market using a rational expectations model that allows for private storage expected price responsive production and arbitrary support and release price s a salient feature of the model is that private storage and product ion behavior adjusts to changes in government policy stochastic simu lations of the market model demonstrate that price stabilization prog rams can reduce long run market price and destabilize producer revenu e copyright 1988 by american economic association

how much of commodity price behavior can a rational expectations storage model explain a rational expectations competitive storage model was applied to the u s corn market to assess the aptness of this framework in explaining monthly price behavior in an actual commodity market relative to previous models extensive realism was added to the model in terms of how production activities and storage costs are specified by modeling convenience yield backwardation in prices between crop years did not depend on the unrealistic assumption of zero ending stocks our model generated cash prices that were distributed with positive skewness and kurtosis and mean and variance that increased over the storage season comparable to the persistence and the occasional spikes observed in commodity prices futures prices were generated as conditional expectations of cash prices at contract maturity and the variances of futures prices exhibited realistic time to maturity and seasonal patterns model realizations of cash and futures prices over many years were used to demonstrate the wide variety of price behaviors that could be observed in an efficient market with a similar market structure implying that economic and policy implications drawn from short historical samples of prices could be misleading

optimal cartel trigger price strategies abstract a dynamical model of industry equilibrium is described in which a cartel deters deviations from collusive output levels by threatening to produce at cournot quantities for a period of fixed duration whenever the market price falls below some trigger price in this model firms can observe only their own production level and a common market price the market demand curve is assumed to have a stochastic component so that an unexpectedly low price may signal either deviations from collusive output levels or a downward demand shock

the real interest rate and aggregate supply abstract this paper analyzes the effects of the anticipated real interest rate on aggregate supply variables in a model where time to produce and variable capital utilization play a crucial role the potential importance of the present mechanism for business cycle theory lies in its ability to generate positive co movements of employment capital utilization labor productivity output and investment these variables are predicted to be affected negatively by the real interest rate reduced forms for output and employment are derived and tested with canadian data taking estimates of the real interest rate prevailing in the united states as the relevant exogenous price

bubbles in food commodity markets four decades of evidence abstract we use daily prices from individual futures contracts to test whether speculative bubbles exist in 12 agricultural markets and to identify whether patterns of bubble behavior exist over time the samples begin as far back as 1970 and run through 2011 the findings demonstrate that all 12 agricultural markets experienced multiple periods of price explosiveness however bubble episodes represent a very small portion between 1 5 and 2 of price behavior during the 42 year period in addition most bubbles are short lived with 80 90 lasting fewer than 10 days though receiving far less attention negative bubbles contribute significantly to price behavior accounting for more than one third of explosive episodes markets over react during both positive and negative explosive episodes leading to a correction as they return to a random walk this adjustment back to fundamental values is most pronounced with positive bubbles particularly in the earlier part of the sample while the magnitudes of the corrections are generally small there were a few instances of significant increases in prices and large over reactions most notably in the softs e g cocoa 1973 coffee 1994 cotton 2010 we also find that explosive periods did not become more common or last longer in the second half of the sample period and that the most recent bubble episodes may not have been as severe as in mid 1970s

government intervention and strategic trading in the u s treasury market we study the impact of permanent open market operations pomos by the federal reserve on u s treasury market liquidity using a parsimonious model of speculative trading we conjecture that i this form of government intervention improves market liquidity contrary to conclusions drawn by existing literature and ii the extent of this improvement depends on the market s information environment evidence from a novel sample of federal reserve pomos during the 2000s indicates that bid ask spreads of on the run treasury securities decline when pomos are executed by an amount increasing in proxies for information heterogeneity among speculators fundamental volatility and pomo policy uncertainty consistent with our model

the value of public information in storable commodity markets application to the soybean market this article provides a framework to estimate the potential effects and benefits of the provision of market information in storable commodity markets this framework is applied to the case of production forecasts for the soybean market a rational expectations storage model of the global soybean market accounting for both inter annual and intra annual market dynamics is built shocks that occur between planting and harvesting affect the size of the potential harvest estimates of the size of these shocks are reported publicly and affect the market equilibrium through adjustments to stock levels by varying counterfactually the observability of seasonal shocks we can estimate the efficiency gains related to the availability of advance information they are equivalent to 2 of storage costs the reduction of stock levels being the main channel explaining the welfare gains the presence of advance information has a limited effect on inter annual price volatility but redistributes price volatility during the season increasing it just before harvest when almost all news has been received and stocks are tight and decreasing it after harvest the effect of news shocks is stronger on higher order moments of the distribution with a strong decrease in skewness and kurtosis related to the lower frequency of price spikes

extent and possible causes of intrayear agricultural commodity price volatility wheat corn rice soybeans and cotton experienced higher volatility in the second half of the 2000s for the sample at hand the unit root tests only validate a new period of high volatility for wheat and cotton if in the next couple of years however corn rice and soybeans maintain their higher volatility a new period of high volatility may also be validated statistically regarding the factors driving the intrayear volatility gmm estimates show that commodity market fundamentals i e the stock to use ratio and to a lesser extent the degree of internationalization are the most systematically statistically significant coefficients among commodities over time consecutive low stock to use ratios and a thin international market provoke typically high volatility speculative activity and liquidity in the agricultural derivative market have a stabilizing effect on the spot price if any finally common macro factors significantly impact volatility especially the volatility of petrol and of exchange rates their dispersion importance over the sample is quite sizeable however it is difficult to establish a link between on the one hand loose monetary policy business cycle and inflation and on the other hand commodity price volatility as the sign of the estimated coefficient changes depending on the commodity and the estimated elasticities are quite low

commodity prices and unit root tests price theory suggests that commodity prices should be stationary series yet tests for unit roots rather frequently imply that these prices are not stationary this seeming inconsistency is investigated by applying alternative specifications of unit root tests to prices of corn soybeans barrows and gilts and milk the preponderance of evidence suggests that nominal prices do not have unit roots but the results are sensitive to the specification of the test equation accounting for a structural change that shifts the mean appears to be an important issue in unit root tests

u s farm policy and the volatility of commodity prices and farm revenues a dynamic three commodity rational expectations storage model is used to compare the impact of the federal agricultural improvement and reform fair act of 1996 with a free market policy and with pre fair policies results suggest that fair did not lead to significant increases in long run price volatility or revenue volatility the main impact of pre fair relative to the free market regime was to substitute government storage for private storage in a way that did little to support prices or to stabilize farm incomes results also indicate that u s grain market volatility in 1995 2000 was due to fundamental market forces and not to fair copyright 2002 oxford university press

capital inflows and euro area long term interest rates abstract capital flows into the euro area were particularly large in the mid 2000s and the share of foreign holdings of euro area securities increased substantially between the introduction of the euro and the outbreak of the global financial crisis we show that the increase in foreign holdings of euro area bonds in this period is associated with a reduction of euro area long term interest rates by about 1 55 percentage points which is in line with previous studies that document a similar impact of foreign bond buying on us treasury yields these results are relevant both from a euro area and a global perspective as they show that the phenomenon of lower long term interest rates due to foreign bond buying is not exclusive to the united states and foreign inflows into euro area debt securities may have added to increased risk appetite and hunt for yield at the global level

what causes commodity price backwardation a recently proposed explanation for futures price backwardation is examined an equilibrium model with spatial heterogeneity leads to the interpretation of backwardations as mismeasurement by the analyst however the model predicts that backwardations are more affected by the location of stocks than by their aggregate level empirical examination of the united states corn market fails to support this result

the laffer curve revisited abstract laffer curves for the us the eu 14 and individual european countries are compared using a neoclassical growth model featuring constant frisch elasticity cfe preferences new tax rate data is provided the us can maximally increase tax revenues by 30 with labor taxes and 6 with capital taxes we obtain 8 and 1 for the eu 14 there 54 of a labor tax cut and 79 of a capital tax cut are self financing the consumption tax laffer curve does not peak endogenous growth and human capital accumulation affect the results quantitatively household heterogeneity may not be important while transition matters greatly

fiscal policy with heterogeneous agents and incomplete markets i undertake a quantitative investigation into the short run effects of changes in the timing of proportional income taxes for model economies in which heterogeneous households face a borrowing constraint temporary tax changes are found to have large real effects in the benchmark model a temporary tax cut increases aggregate consumption on impact by around 29 cents for every dollar of tax revenue lost comparing the benchmark incomplete markets model to a complete markets economy income tax cuts provide a larger boost to consumption and a smaller investment stimulus when asset markets are incomplete copyright 2005 wiley blackwell

estimating supply response in the presence of farm programs previous empirical research on crop supply response has given insufficient attention to the fundamentally different nature of supply response under farm programs versus competitive markets a simple theoretical model is presented which highlights the program participation option in the farmer s acreage allocation decision the model also provides the basis for different expected supply elasticities under free market and farm program regimes for corn and soybeans econometric supply estimation for corn belt states for 1948 80 using a temporally disaggregated approach confirms a greater supply elasticity for corn and a lower supply elasticity for soybeans under acreage restricting feed grain programs

fiscal policy and asset prices with incomplete markets we study the simultaneous impact of fiscal policy decisions on macroeconomic activity wealth distribution and asset prices we consider a general equilibrium overlapping generations model with incomplete markets and heterogeneous agents where government debt and capital are imperfect substitutes increases in public debt lead to significant increases in the riskless rate and to a reduction in the equity premium while higher capital income tax rates lead to a higher equity premium the crowding out effects on capital and output are much higher than in models where government debt and capital are perfect substitutes which thus ignore households portfolio reallocation decisions the author 2012 published by oxford university press on behalf of the society for financial studies all rights reserved for permissions please e mail journals permissions oup com oxford university press

on the possibility of price wars when firms use a tit for tat strategy abstract the purpose of this paper is to illustrate how price wars can periodically occur in an industry even when all the firms behave cooperatively and each firm has no intention of cheating by attempting to undercut the other firms

cross border auction cycle effects of sovereign bond issuance in the euro area we provide evidence for the euro area of spillovers from foreign public debt auctions into domestic secondary market auction cycles we also confirm existing evidence of such spillovers from domestic issues into the domestic secondary market consistent with a theory of primary dealers limited risk bearing capacity we find that auction cycles from domestic issues are stronger during the recent crisis period whereas cross border effects are stronger in the precrisis period but this evidence is not strong this finding likely reflects the opposing effects of reduced sovereign bond market integration during the crisis and higher yield covariances caused by more market volatility

bounded price variation and rational expectations in endogenous switching model of the u s corn market a model that includes bounded price variation and rational expectations by producers is estimated for the u s corn market the resulting model specification is highly nonlinear though since the probability of market equilibrium must be determined endogenously unlike previous research the cross equation restrictions implied by the rational expectations hypothesis are incorporated in the bounded prices model by using fair and taylor s 1983 procedure for obtaining maximum likelihood estimates of nonlinear rational expectations models the resulting model is compared against a standard equilibrium model with naive expectations the results show the bounded prices model is a superior specification copyright 1989 by mit press

the macroeconomic effects of government debt in a stochastic growth model abstract this paper studies how government liabilities affect macroeconomic aggregates in a standard general equilibrium growth model there are two principal results i though it is often thought that fiscal deficits crowd out investment this paper shows that deficit financed cuts in distortionary income taxation may stimulate investment even if agents expect future taxes on capital income to be higher this result is dependent on the values of two key parameters the elasticity of labor supply and the degree of persistence in the government debt process ii the economy s response to an increase in government expenditure depends on how it is financed distortionary tax finance may lead to a decline in output consumption and investment in contrast deficit finance may increase output and consumption

taxing capital not a bad idea after all we quantitatively characterize the optimal capital and labor income tax in an overlapping generations model with idiosyncratic uninsurable income shocks and permanent productivity difierences of households the optimal capital income tax rate is signiflcantly positive at 36 percent the optimal progressive labor income tax is roughly a at tax of 23 percent with a deduction of 7 200 relative to average household income of 42 000 the high optimal capital income tax is mainly driven by the life cycle structure of the model whereas the optimal progressivity of the labor income tax is attributable to the insurance and redistribution role of the tax system jel e62 h21 h24

drivers and triggers of international food price spikes and volatility the objective of this study is to explore empirical evidence about the quantitative importance of supply demand and market shocks for price changes in international food commodity markets to this end it distinguishes between root conditional and internal drivers of price changes using three empirical models 1 a price spike model in which monthly food price returns spikes are estimated against oil prices supply and demand shocks and excessive speculative activity 2 a volatility model in which annualized monthly variability of food prices is estimated against the same set of variables plus a financial crisis index and 3 a trigger model that estimates extreme values of price spikes and volatility using quantile regressions the results point to increasing linkages between food energy and financial markets this explains much of the observed food price spikes and volatility while financial speculation amplifies short term price spikes oil price volatility intensifies medium term price volatility

acreage decisions under risk the case of corn and soybeans an acreage supply response model is developed under expected utility maximization the resulting framework is used to specify and estimate a system of risk responsive acreage equations for corn and soybeans in the united states particular attention is given to the truncation effects of government price supports on the distribution of corn and soybean prices also a wealth variable is included in the acreage equations the empirical results indicate that risk and wealth variables play an important role in cornsoybean acreage decisions the analysis also shows that cross commodity risk reduction is important in acreage allocation decisions

bivariate garch estimation of the optimal commodity futures hedge six different commodities are examined using daily data over two futures contract periods cash and futures prices for all six commodities are found to be well described as martingales with near integrated garch innovations bivariate garch models of cash and futures prices are estimated for the same six commodities the optimal hedge ratio ohr is then calculated as a ratio of the conditional covariance between cash and futures to the conditional variance of futures the estimated ohrs reveal that the standard assumption of a time invariant ohr is inappropriate for each commodity the estimated ohr path appears non stationary which has important implications for hedging strategies

a century of research on agricultural markets this article provides a perspective on major innovations in research on agricultural markets over the past century we review research on market structure and performance vertical coordination arrangements and institutions for producer collective action contributions to empirical modeling of agricultural price determination and marketing margins are also evaluated as are innovations in research on spatial market relationships and the role of storage finally we discuss contributions to understanding market information systems and the functioning of market based mechanisms for agri

why are excess returns on china s treasury bonds so predictable the role of the monetary system abstract it is well documented that the time varying bond excess returns can be explained by predetermined variables such as information in the term structure and macro economic variables recent studies suggest that demand and supply of bonds influence bond excess returns we extend the literature and find that monetary system attributes affect return dynamics in the bond market by introducing a theoretical model to forecast excess returns on treasury bonds in the context of china s unique monetary system this paper attributes the predicted components of bond excess returns mainly to the inflexible term structures of official interest rates set by china s central bank

on the pitfalls of multi year rollover hedges the case of hedge to arrive contracts it is shown that it is theoretically infeasible for multi year rollover hedge to arrive contracts and for rollover hedges in general to succeed at locking in high current prices for crops to be harvested one or more years into the future the study utilizes 107 years of data to present strong empirical evidence that the corn market behaves remarkably similarly to what price theory predicts results also confirm that short historical time series are unreliable for predicting rare events hence empirical studies of risk management contracts capitalizing on unusual occurrences should use samples sufficiently large to contain a meaningful number of relevant observations copyright 2001 oxford university press

what explains price volatility changes in commodity markets answers from the world palm oil market abstract what are the sources of commodity price volatility changes based on observation of the palm oil market 1818 1999 our hypothesis is that the superimposition of short distance operators located near the export supply whose expectation horizon is limited to a few weeks and long distance operators further from the export supply whose expectation horizon exceeds six months to one year is responsible for volatility changes and market instability because of the superimposition of expectations horizons volatility grows along with the development of short distance trade we support this hypothesis using a trader behavior model derived from day and huang j econ behavior org 14 1990 299 and day complex economic dynamics vol i mit press cambridge ma our simulation results challenge the argument that trade liberalization and market enlargement necessarily reduce commodity prices volatility

asset pricing and the propagation of macroeconomic shocks this paper considers the implications of habit formation and financial frictions for the propagation of macroeconomic shocks in a model that is capable of matching asset pricing moments a short lived shock that destroys a small fraction of the economy s stock of pledgeable collateral generates a persistent recession a stock market crash and a flight to safety effect this novel mechanism creates a tight link between the asset pricing implications of macroeconomic models and their ability to propagate and amplify the effects of macroeconomic shocks

the inefficiency of interest rate subsidies in commodity price stabilization interest rate subsidies have been used to stimulate commodity stockholding with the intention of stabilizing prices however reductions in price variability can be achieved at less government cost using a direct storage subsidy and it is possible that an interest rate subsidy will increase price variability even though the interest subsidy increases mean stocks held these results are demonstrated using a stochastic dynamic programming model of optimal private storage with parameter values relevant to agricultural commodity markets and with particular reference to the u s soybean market

implications of commodity price behavior for marketing strategies prices of agricultural commodities have systematic dynamic components and many agricultural economists have thought that forecasts of this behavior ought to aid marketing decisions thereby raising producers returns but if commodity markets are pricing efficient then noncompetitive profit opportunities should be quickly arbitraged away thus a debate exists about the magnitude of the likely benefits of various marketing strategies herein we address the question what does the literature about commodity price behavior contribute to our understanding of the expected outcomes from alternative marketing strategies our brief answer is as follows spot prices in u s commodity markets typically behave in a way that is consistent with efficient markets systematic behavior persists because of the costs of arbitrage hence price forecasts in the public domain cannot be used to produce returns which are consistently above the competitive norm although low cost strategies to manage price risk exist evaluating the evidence on these topics is not easy however because the price generating processes are complex sometimes prices seem to behave as if a market is inefficient advice based on analyses using short samples should be used with great caution the remainder of the article elaborates

the behavior of bid ask spreads in the electronically traded corn futures market this is the first paper to analyze liquidity costs in agricultural futures markets based on the observed bid ask spread bas faced by market participants the results reveal a highly liquid corn market that mostly offers order execution at minimum cost the bas responds negatively to volume and positively to price volatility but also affects volume traded and price volatility while statistically significant these responses on a cents bushel or a percentage basis are generally small liquidity costs are also virtually impervious to short term changes in demand for spreading and trend following trader activity as well as differences from day of the week changes in market activity much larger cents bushel and percentage changes in bas occur during commodity index trader roll periods and on usda report release days the roll period findings indicate a sunshine trading effect while announcement effects identify the importance of unexpected information and adverse selection on order execution costs overall our research demonstrates that the transition to electronic trading in the corn futures market has led to low and stable liquidity costs despite the market turbulence in 2008 2009

announcement effects and the theory of storage an empirical study of lumber futures we investigate how lumber futures returns are affected by monthly housing starts announcements and analyze the dependence of the response on lumber inventories and time to delivery to do so we develop a generalized least squares gls method to jointly analyze simultaneously traded contracts we find that increases in the unanticipated component of housing starts announcements increase returns on lumber futures contracts further and as predicted by the theory of storage but previously unrecorded the effects of housing starts shocks decline with lumber inventories there is also a time to delivery effect near delivery contracts respond more sharply to housing starts news than do farther out contracts

regime switches agents beliefs and post world war ii u s macroeconomic dynamics the evolution of inflation and output over the last 50 years is examined through the lens of a micro founded model that allows for changes in the behavior of the federal reserve and in the volatility of structural shocks agents are aware of the possibility of regime changes and their beliefs have an impact on the law of motion underlying the macroeconomy the results support the view that there were regime switches in the conduct of monetary policy however the behavior of the federal reserve is identified by repeated fluctuations between a hawk and a dove regime instead of by the traditional pre and post volcker structure counterfactual simulations show that if agents had anticipated the appointment of an extremely conservative chairman inflation would not have reached the peaks of the late 70s and the inflation output trade off would have been less severe these beliefs counterfactuals are new in the literature finally the paper provides a bayesian algorithm to handle the technical difficulties that arise in a rational expectations model with markov switching regimes

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

long run implications of investment specific technological change an attempt is made to disentangle its effects from the more traditional hicksneutral form of technological progress the balanced growth path for the model is characterized and calibrated to u s national income and product account nipa data the quantitative analysis suggests that investment specific technological change accounts for the major part of growth jel e13 030 041 047

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

dynamic corn supply functions a model with explicit optimization both static and dynamic models have been used to estimate aggregate supply elasticities for annual crops the early studies relied on static singleequation models in a few variables assumed static price expectations e g kohls and paarlberg and produced very small estimates of own price supply elasticities e g 0 07 for corn nerlove 1956 1958a and nerlove and addison showed that agricultural supply models incorporating adaptive price expectations and or dynamic resource adjustment produced larger estimates of supply elasticities for corn and other agricultural commodities additionally they showed that supply elasticities obtained from static models need not be bounded by the short run and long run supply elasticities of

the impact of the federal reserve s large scale asset purchase programs on corporate credit risk estimating the effect of federal reserve s announcements of large scale asset purchase lsap programs on corporate credit risk is complicated by the simultaneity of policy decisions and movements in prices of risky financial assets as well as by the fact that both interest rates of assets targeted by the programs and indicators of credit risk reacted to other common shocks during the recent financial crisis this paper employs a heteroskedasticity based approach to estimate the structural coefficient measuring the sensitivity of market based indicators of corporate credit risk to declines in the benchmark market interest rates prompted by the lsap announcements the results indicate that the lsap announcements led to a significant reduction in the cost of insuring against default risk as measured by the cdx indexes for both investment and speculative grade corporate credits while the unconventional policy measures employed by the federal reserve to stimulate the economy have substantially lowered the overall level of credit risk in the economy the lsap announcements appear to have had no measurable effect on credit risk in the financial intermediary sector

long term interest rates and public debt maturity this paper adds to the literature studying how fiscal variables affect long term interest rates using a sample of sixteen oecd countries over the period 1980 2007 we show that a one year increase in the maturity of the public debt lowers the long term interest rate by on average 20 30 basis points this negative effect is found for both static and panel vector autoregressive specifications country sample splits suggest that it is present in particular for low maturity or high inflation countries

commodity price comovement and financial speculation the case of cotton recent booms and busts in commodity prices have generated concerns that financial speculation causes excessive commodity price comovement driving prices away from levels implied by supply and demand under rational expectations we develop a structural vector autoregression model of a commodity futures market and use it to explain two recent spikes in cotton prices in doing so we make two contributions to the literature on commodity price dynamics first we estimate the extent to which cotton price booms and busts can be attributed to comovement with other commodities finding such comovement would be necessary but would not be sufficient evidence to establish that broad based financial speculation drives commodity prices second after controlling for aggregate demand and comovement we develop a new method to point identify shocks to precautionary demand for cotton separately from shocks to current supply and demand to do so we use differences in volatility across time implied by the rational expectations competitive storage model we find limited evidence that financial speculation caused cotton prices to spike in 2008 or 2011 we conclude that the 2008 price spike was driven mostly by precautionary demand for cotton and the 2011 spike was caused by a net supply shortfall

accounting for the u s earnings and wealth inequality we show that a theory of earnings and wealth inequality based on the optimal choices of ex ante identical households that face uninsured idiosyncratic shocks to their endowments of efficiency labor units accounts for the u s earnings and wealth inequality almost exactly

generalized optimal hedge ratio estimation a generalized approach to estimating optimal hedge ratios on futures markets is developed the generalized approach is not difficult to apply and provides a framework for evaluating the appropriateness of conventional simple regression approaches to optimal hedge ratio estimation in an application to storage hedging of corn soybeans and wheat it is found that simple regression using price levels or returns leads to errors in optimal hedge ratio estimation but that simple regression using price changes provides reasonably accurate estimates

autoregressive conditional heteroscedasticity in commodity spot prices muth s 1961 rational expectations model of commodity markets implies that inventory carryover creates arch processes in prices the model also indicates that the expected price variance is an explanatory variable in price regressions hypotheses were tested on price data of twenty commodities using a variation of engle et al 1987 arch m technique an arch process was found in storable and not in non storable commodity data as expected however changes in expected price variance have no significant impact on price copyright 2001 john wiley sons ltd

estimating a nonlinear rational expectations commodity price model with unobservable state variables this paper is concerned with the estimation of a model in which a possibly serially correlated stochastic process the harvest of an agricultural commodity generates a competitive price in a market comprising both final consumers and risk neutral speculators who can store the commodity at a cost in the anticipation of profit because storage cannot be negative the relationship between prices and harvests is inherently nonlinear and is an unpromising candidate for a linear quadratic model or for linearization more generally instead we calculate numerically a policy function in which price is a function of two unobservable state variables the harvest and current availability and we use the result to fit the price data

price dynamics in biological production processes exposed to environmental shocks this paper demonstrates a mechanism by which environmental shocks in biological production processes can lead to extreme price movements and thus be a contributing factor to short term food price volatility in biological production processes environmental shocks can lead to a stock out when the harvest transitions to a new stock year class with a different marginal value the result in the market is a temporary price spike or bubble bounded by the marginal value of the new stock we highlight this phenomenon in a cohort or year class biological production setting each year class in the model is a finite non renewable capital stock and capital theory is used to solve for the stochastic dynamic competitive equilibrium the model is parameterized to be representative of the norwegian salmon aquaculture industry results suggest that the model can replicate much of the observed patterns in price harvest and capital stock dynamics including the infrequent occurrence of extremely high prices in the market

large scale bond purchases in a currency union with segmentation in the market for government debt abstract the literature on large scale purchases of government debt emphasises the importance of bond market segmentation along the maturity dimension for their transmission this study investigates how another form of segmentation that we observe the segmentation of government bond markets across countries can be exploited by the central bank of a currency union in which fiscal coordination is not attainable it is shown first that under general conditions government bond purchases which lower bond yields have first order effects on demand and hence inflation through a fiscal channel even in the absence of heterogeneity in investment opportunities the total effect on aggregate demand can be broken down into an income from debt issuance effect and a primary surplus effect as a result the central bank is able to use government bond purchases to control the terms of trade and achieve asymmetric degrees of stimulus across the members of the currency union without a transfer of resources if there is cross country segmentation in bond markets and home bias in government spending the paper characterises the welfare optimising mix of conventional interest rate policy and bond purchases in this scenario and gives an upper bound on the welfare benefits from using the additional tool

the value of public information in commodity futures markets abstract the informational value of u s department of agriculture usda corn and soybean production forecasts is investigated for the period 1971 1992 three tests of informational content are applied overall the results suggest usda corn and soybean forecasts provide valuable information to participants in commodity futures markets this value does appear to have declined especially since the mid 1980s

income and wealth heterogeneity in the macroeconomy how do movements in the distribution of income and wealth affect the macroeconomy we analyze this question using a calibrated version of the stochastic growth model with partially uninsurable idiosyncratic risk and movements in aggregate productivity our main finding is that in the stationary stochastic equilibrium the behavior of the macroeconomic aggregates can be almost perfectly described using only the mean of the wealth distribution this result is robust to substantial changes in both parameter values and model specification our benchmark model whose only difference from the representative agent framework is the existence of uninsurable idiosyncratic risk displays far less cross sectional dispersion and skewness in wealth than u s data however an extension that relies on a small amount of heterogeneity in thrift does succeed in replicating the key features of the wealth data furthermore this extension features aggregate time series that depart significantly from permanent income behavior

are harvest forecasts news usda announcements and futures market reactions futures market price data for maize and soyabeans are used to examine reactions to us department of agriculture harvest forecasts these forecasts are widely known and reasonably accurate so failure to find significant reaction would indicate that the usda did not contribute additional news relative to information already possessed by traders various t tests f tests and nonparametric chi square tests indicate rejection of the null hypothesis of no significant difference between means of absolute values or variances of changes in closing prices on days following a usda announcement and other days thus the data indicate that significant information is contained in the forecasts

unconventional monetary policy the assessment the uncon ventional monetary policy measures adopted by the major central banks in the period since 2008 are discussed in this paper we highlight some important differences between quan titative easing and conventional monetary policy and then evaluate the mechanisms through which quantitative easing may propagate to financial markets and the real economy drawing on perspec tives from monetarist and new keynesian theory additional measures intended to supplement or strengthen the effects of pure quantitative easing often termed unconventional unconventional monet ary policy are also assessed in our discussion we relate the various articles in this issue to some of the key research questions posed in relation to unconventional monetary policy

the variety of maturities offered by firms and institutional investment in corporate bonds we study how a firm s decision to offer bonds of various maturities affects the portfolio allocations of institutional investors we argue that because of lower information collection costs institutional investors tilt their portfolios towards firms that offer bonds of various maturities we show that this translates into lower bond yields both in the primary and in the secondary bond markets

limits of arbitrage theory and evidence from the mortgage backed securities market limits of arbitrage theories hypothesize that the marginal investor in a particular asset market is a specialized arbitrageur rather than a diversified representative investor we examine the mortgage backed securities mbs market in this light we show that the risk of homeowner prepayment which is a wash in the aggregate is priced in the mbs market the covariance of prepayment risk with aggregate wealth implies the wrong sign to match the observed prices of prepayment risk the price of risk is better explained by a kernel based on mbs market wide specific risk consistent with the specialized arbitrageur hypothesis a number of recent limits of arbitrage theories predict that the distressed liquidation of assets by hedge funds results in a large drop in asset prices see for example shleifer and vishny 1997 kyle and xiong 2001 gromb and vayanos 2002 geanakoplos 2003 or he and krishnamurthy 2006 these theories are often referenced in explaining episodes of market illiquidity and falling asset prices such as the events during the fall of 1998 in traditional asset pricing theory the marginal investor in every asset market is the same broadly diversified representative investor thus a hedge fund liquidating 200 billion of mortgage backed securities finds a large pool of ready buyers comparable to the entire capital market and the liquidation does not affect expected returns because the representative investor acts quickly to eliminate excess returns according to the limits of arbitrage theory on the other hand the marginal investor in a particular asset market is an investor who specializes in that market in this case liquidations can have large effects on prices given that the relevant set of buyers is a smaller specialized pool of investors

asset pricing with limited risk sharing and heterogeneous agents we develop a model with incomplete markets and heterogeneous agents that generates a large equity premium while simultaneously matching stock market participation and individual asset holdings the high risk premium is driven by incomplete risk sharing among stockholders which results from the combination of aggregate uncertainty borrowing constraints and a realistically calibrated life cycle earnings profile subject to idiosyncratic shocks we show that it is challenging to simultaneously match asset pricing moments and individual portfolio decisions while limited participation has a negligible impact on the risk premium contrary to the results of models where it is imposed exogenously

why does on farm storage fail to mitigate price volatility we analyze the role of farm stock management on price volatility under liquidity constraints and heterogeneous price expectations in commodity markets speculative behaviors by stockholders tend to reduce price volatility but this is not the case in certain agricultural markets where speculation by farmers regarding decisions to sell or store grain are subject to liquidity constraints and heterogeneous price expectations like stockholders most farmers sell grain if they expect a price drop in the near future but unlike stockholders they are not necessarily able to purchase grain if they expect a price increase in the next period heterogeneous price expectations can also lead to suboptimal storage decisions further increasing price volatility for these reasons the storage management behavior of farmers often fails to mitigate price drops in the way that speculation by stockholders does we merge historical data on maize prices and household storage collected in burkina faso in order to build a dynamic panel over the 2005 2012 period we show that carry over from one season to the next is associated with unexpected price drops during the preceding lean season and that carry over is associated with more frequent unexpected price drops following the subsequent post harvest season this article is protected by copyright all rights reserved

fiscal policy in general equilibrium this paper studies four classic fiscal policy experiments within a quantitatively restricted neoclassical model the authors main findings are as follows 1 permanent changes in government purchases can lead to short run and long run output multipliers that exceed one 2 permanent changes in government purchases induce larger effects than temporary changes 3 the financing decision is quantitatively more important than the resource cost of changes in government purchases and 4 public investment has dramatic effects on private output and investment these findings stem from important dynamic interactions of capital and labor absent in earlier equilibrium analyses of fiscal policy copyright 1993 by american economic association

a hybrid spline based parametric model for the yield curve empirical evidence indicates that both nominal and real yield curves in important markets have segmentation between their short end and their longer maturity segments this segmentation might affect term structure estimation introducing distortions in longer maturity yields especially in parametric models in order to deal with such segmentation we propose a new model that combines the flexibility of spline functions with the parsimoniousness of a parametric four factor exponential model the short end of the yield curve is fitted using a b spline function while longer segments are captured by the parametric model we illustrate the benefits of the proposed model for pricing and risk management purposes using two examples the real yield curve in the brazilian government index linked bond market and the us treasury nominal yield curve we show that in both markets our model is simultaneously able to fit the yield curve well and to provide unbiased value at risk estimates for all tested portfolios of bonds outperforming an important parametric benchmark model frequently adopted by central banks

using the competitive storage model to estimate the impact of ethanol and fueling investment on corn prices abstract the impact of biofuel mandates on the prices of commodities used to produce food continues to be a major consideration by policy makers more recently concern about high compliance costs of oil companies due to mandates led to reductions in us biofuel mandates to gain insights into the policy impacts of mandates on agricultural commodity prices and compliance costs requires development of dynamic models that can capture the fact that many agricultural commodities used to produce biofuels can be stored and that flexible compliance mechanisms allow for banking and borrowing of tradable permits us biofuel mandates are enforced using a system of tradable permits called rins rin market dynamics are important because rins can be banked for the future or borrowed from the future corn is the primary u s biofuel feedstock and is storable rational expectations competitive storage models are well suited to capture the dynamic behavior of commodity markets such a model is developed here for corn and rin markets to estimate the impacts of alternative future ethanol mandate levels the model considers corn use for ethanol storage and all other uses in each period accounting for two random variables oil prices and corn yields borrowing and banking provisions of the renewable fuels standard mandate are explicitly integrated into the model we use the model to provide estimates of the impact on corn prices corn plantings and ethanol production under two ethanol mandate scenarios for six marketing years from 2016 17 our scenarios are a combination of volume requirements and infrastructure investment the first scenario is one in which corn ethanol mandates stay the same as required in the current and proposed rfs and additional e85 stations are introduced that allow for compliance with higher mandates the second scenario is one in which no investment occurs and the environmental protection agency reduces the mandate to 13 87 billion gal a level that can just be met with 10 percent ethanol blends comparing the results for two scenarios we find that average corn prices are about 5 to 6 lower with the reduced mandates or about 22 to 30 cents per bushel while average rin prices drop from around 60 to 40 cents per rin

what is the effect of unconventional monetary policy on bank performance this paper examines the relationship between unconventional monetary policy and the us banking performance unconventional monetary policy is captured through the central bank s assets and excess reserves results show that unconventional monetary policy has a negative relationship with bank performance further analysis shows that the negative association between unconventional monetary policy and performance is mitigated for banks with a high level of asset diversification and low deposit funding we also find that the negative relationship between unconventional monetary policy and performance subdues for deposit insured financial institutions finally we use dynamic panel threshold analysis which reveals that the negative association between unconventional monetary policy and bank performance is particularly pronounced above the reported threshold value

looking for evidence of speculative stockholding in commodity markets abstract the theory of commodity price with speculative storage predicts that prices are a two regime process depending on whether or not inventories are held the price process is nonlinear in that it is nondifferentiable at some p which separates the data into a history independent regime and an autoregressive process this paper looks for evidence of nonlinearity in the price data and tests the theory in the context of threshold autoregressive models under the assumption that shocks to harvest are i i d while we find evidence for regime specific behavior we also find the degree of persistence in the stockout regime to be much stronger than that predicted by theory

political uncertainty and public financing costs evidence from u s gubernatorial elections and municipal bond markets this research investigates how political uncertainty around u s gubernatorial elections in uences the borrowing costs of public debt measured by yields of municipal bonds our evidence from both the new issuance market and the secondary market shows that yields of municipal bonds increase sharply by 6 to 8 basis points before elections and then reverse afterward elections have more pronounced impact during economic downturns when outcomes are less predictable and when states have more outstanding debt several state institutions such as gaap budgeting spending limits and tax increase limits help to mitigate the adverse impact of political uncertainty

optimal fiscal policy in a business cycle model this paper develops the quantitative implications of optimal fiscal policy in a business cycle model in a stationary equilibrium the ex ante tax rate on capital income is approximately zero there is an equivalence class of ex post capital income tax rates and bond policies that support a given allocation within this class the optimal ex post capital tax rates can range from close to independently and identically distributed to close to a random walk the tax rate on labor income fluctuates very little and inherits the persistence properties of the exogenous shocks thus there is no presumption that optimal labor tax rates follow a random walk most of the welfare gains realized by switching from a tax system like that of the united states to the ramsey system come from an initial period of high taxation on capital income

saving and liquidity constraints this paper is concerned with the theory of saving when consumers are not permitted to borrow and with the ability of such a theory to account for some of the stylized facts of saving behavior the models presented in the paper seem to account for important aspects of reality that are not explained by traditional life cycle models copyright 1991 by the econometric society

modeling expectations of bounded prices an application to the market for corn the presence of farm programs should directly affect the expectations of producers this paper analyzes the formation of price expectations when price supports constitute an effective lower bound on the distribution of the expectations we first investigate what the expected price would be if the usual rational expectations formula is used this leads to a relationship that is not estimable we suggest two alternatives one based on a tobit approximation and the other based on a perfect prediction of when the support is going to be effective using a simplified model of the u s corn market the methodology is demonstrated and compared to an alternative method of using futures prices as the expectation of harvest price the analysis of supply response for the major u s field crops is made difficult due to government intervention in these markets this intervention has been characterized by the use of price supports acreage diversion storage incentives etc during the last thirty years many studies have analyzed producer behavior in the presence of governmental involvement such studies have typically been concerned with modeling the effect of supports and diversions in an ex post sense rather than with how producers used the knowledge of farm programs to form their expectations if producers are rational economic agents their expectations of harvest prices should be conditioned both by free market forces and the type and degree of governmental intervention in the market of course farm programs have varied in nature and extent during the past thirty years and it is doubtful that any structural model could capture their complexities in this paper we attempt to introduce rational expectations in a simplified model of the u s corn market in essence we focus on the formation of price expectations when price supports constitute an effective lower bound on the distribution of the expectations we proceed by developing a theoretical model that connects the rational expectations model with a model of bounded price variation it is shown that one representation that may characterize the corn market is a triangular structural system with endogenous switching a full information maximum likelihood estimator is proposed for the system next an empirical model is specified and estimated the model is evaluated in comparison to an augmented model that contains a futures price so that some inferences may be made concerning the rational expectations model s success in summarizing relevant market information expectations under bounded prices consider a market that may be represented by a simple supply and demand system q a pt a2w el supply function pt b qt b2xt e2t demand function 1 where p and q represent market price and quantity w and x represent supply and demand shifters and p represents the rational expectation of product price at the time production decisions are made note that this system has a familiar recursive structure when the expected price variable is specified in terms of one or more lagged prices when the restricted reduced form of the structural system is solved for in terms of the expected price and this expression is used to replace pj wallis 1980 then models similar to those of goodwin and sheifrin 1982 and shonkwiler and emerson 1982

flow effects of central bank asset purchases on sovereign bond prices evidence from a natural experiment we estimate the response of sovereign bond prices to net supply shocks caused by purchase operations under the ecb s public sector purchase programme pspp to avoid simultaneity bias in the estimated relationship between prices and purchases we exploit a pspp feature that renders securities temporarily ineligible for reasons unrelated to their prices using these purchase restrictions as an instrument to identify exogenous variation in purchase volumes we find that pspp causes statistically significant and economically relevant upward price impacts the impacts are short lived and concentrated in securities issued by higher yield jurisdictions and characterized by higher maturity and lower liquidity

heterogeneity aggregate uncertainty and the short term interest rate this article analyzes the relationship between the short term interest rate and diversity i e the number of types in models with heterogeneous agents and incomplete markets the number of types needed to approximate a continuum varies across examples in all cases however the number of types has little effect on the average interest rate and consumption variability in these models the set of state variables is large because the equilibrium law of motion depends on the cross sectional wealth distribution the article shows how to solve these models numerically by approximating the distribution using moments or percentiles

experimental duopolies under price guarantees in a symmetric differentiated experimental duopoly we test the ability of price guarantees pgs to raise prices above the competitive levels different types of pgs aggressive and soft price beating and price matching are implemented either as an exogenously imposed market rule or as a business strategy our results show that pgs may lead close to the collusive outcome depending on whether the interaction between duopolists is repeated and provided that the guarantee is not of the aggressive price beating type

bond market clienteles the yield curve and the optimal maturity structure of government debt we propose a clientele based model of the yield curve and optimal maturity structure of government debt clienteles are generations of agents at different life cycle stages in an overlappinggenerations economy an optimal maturity structure exists in the absence of distortionary taxes and induces efficient intergenerational risksharing if agents are more risk averse than log then an increase in the long horizon clientele raises the price and optimal supply of long term bonds but while a welfare maximizing government caters to clienteles it does not accommodate fully their demand and limits issuance of long term bonds to a level where these earn negative expected excess returns

impact on corn prices from reduced biofuel mandates press reports indicate that the environmental protection agency may significantly reduce ethanol mandates to levels that can easily be met to gain insight into what this decision implies about the price of corn we use a new model of the corn and rin markets to project corn and ethanol prices and quantities through the 2019 marketing year under two ethanol mandate scenarios the first scenario is the status quo where mandates that can be met with corn ethanol increase to 14 4 billion gallons in 2014 and 15 billion gallons in 2015 and thereafter mandates at this level can only be met using e85 so also included in this scenario is 5 000 new locations where e85 can be purchased the second scenario holds mandates at 13 billion gallons a level that can be met with e10 the price of corn is higher by between 5 and 6 percent about 25 cents per bushel in the higher mandate scenario rin prices are close to zero most of the time in the lower mandate scenario and average between 50 and 60 cents in the higher mandate scenario though the corn price difference is economically meaningful to corn farmers and livestock feeders it is small compared to the price swings that the market has experienced since 2006 this modest change in corn prices from alternative mandate levels suggests that the level of mandate should be determined more by consideration of broad policy objectives rather than the impact on the price of corn of key importance to the advanced biofuel industry is whether policy will support the expansion of biofuels consumption by creating incentives to invest in flex cars and fueling stations that will facilitate expanded consumption of low carbon ethanol consideration of the costs and benefits of creating these incentives as part of a national energy policy is of greater long run importance than the impact of mandates on the price of corn

a theory of commodity price fluctuations this paper studies the price fluctuations of storable commodities that are traded in open markets and are subject to random shocks to demand or more particularly to supply it relaxes the common assumption that the shocks are identically and independently distributed in favor of temporally dependent and periodic disturbances the existence of a unique stationary rational expectations equilibrium is demonstrated for each of the models analyzed and testable implications of the models are derived an illustrative empirical investigation is then undertaken for the model with periodic disturbances using monthly time series observations for seven commodities over the period 1960 93

competitive storage and commodity price dynamics by buying cheap and selling dear risk neutral commodity speculators can smooth commodity prices and induce serial dependence in price even when none would exist under a simple process of supply and demand commodity prices are variable and strongly positively correlated from one year to the next the variability is often explained by supply factors and the autocorrelation by the activities of speculators we show that this explanation is not consistent with the evidence speculation can substantially increase autocorrelation for prices that are weakly autocorrelated in its absence but not to the high levels that are observed in the data

economic behavior under uncertainty a joint analysis of risk preferences and technology a method is developed to estimate jointly risk preferences and technology under general conditions the approach is illustrated in an application to the analysis of u s corn soybean acreage decisions over time the results provide useful information on the nature of farmers risk preferences and on the influence of price risk and production risk on acreage allocation and farmers welfare copyright 1996 by mit press