do formula or competitive grant funds have greater impacts on state agricultural productivity this article examines the impact of public agricultural research and extension on agricultural total factor productivity at the state level the objective is to establish whether federal formula or competitive grant funding of agricultural research has a greater impact on state agricultural productivity a pooled cross section time series model of agricultural productivity is fitted to annual data for forty eight contiguous states over 1970 1999 our results show that public agricultural research and agricultural extension have statistically significant positive impacts on state agricultural productivity in addition hatch formula funding has a larger impact on agricultural productivity than federal competitive grant funding and a reallocation of hatch formula funds to competitive grant funding would lower agricultural productivity this seems unlikely to be a socially optimal policy furthermore from a cost benefit perspective our study shows that the social marginal annualized real rate of return to public resources invested in agricultural research is 49 62 and to public agricultural extension the rate is even larger

limited liability and incentive contracting with ex ante action choices abstract this article examines a principal agent model of financial contracting in which a risk neutral entrepreneur agent makes an unobservable ex ante effort choice while employing the investment funds of a risk neutral investor principal the key innovation is that the investment contract is subject to statutory liability limits given these liability limits two settings are considered one in which the investor payoff function is also constrained to be monotonically nondecreasing in firm profit and another in which no such monotonic contract constraint is imposed in the former case a standard debt contract is shown to emerge and a first best effort choice is not achieved in the latter setting the optimum is characterized by a live or die payoff function and a first best effort level may or may not be realized

delegated portfolio management abstract a problem of screening agents with privately known forecasting abilities and reservation utilities and then eliciting truthful information from these agents once they are employed is considered for the case of risk averse agents and large principals an approximately optimal solution is constructively characterized under the assumption that payoffs are normally distributed a significant extension of the definnetti savage probability elicitation result is developed under this extension knowledge of agent preferences is not required when the underlying conditional distributions are symmetric and this fact is exploited to solve the screening problem in a mean variance formulation

why farmers quit a county level analysis we identify the effects of alternative explanatory variables on the propensity of u s farmers to cease farming with a particular emphasis on understanding the roles of off farm employment and federal farm program payments conventional ordinary least squares analysis using all counties suggests that off farm employment has no statistical effect on the net number of farmers quitting between 1987 and 1997 ceteris paribus a more refined analysis which separates counties losing farmers from those that gained farmers reveals subtle and less clear cut effects of off farm employment and federal program payments on farm exits copyright 2001 oxford university press

moral hazard and the portfolio management problem this paper investigates the significance of nonlinear contracts on the incentive for portfolio managers to collect information in addition the manager must be motivated to disclose this information truthfully we analyze three contracting regimes 1 first best where effort is observable 2 linear with unobservable effort and 3 the optimal contract within the bhattacharya pfleiderer quadratic class we find that the linear contract leads to a serious lack of effort expenditure by the manager this underinvestment problem can be successfully overcome through the use of quadratic contracts these contracts are shown to be asymptotically optimal for very risk tolerant principals

optimal vs traditional securities under moral hazard this paper provides an explanation for the widespread use of traditional securities by wellestablished firms standard moral hazard models predict that equity debt and warrants are almost never optimal financing instruments i show that issuing these securities is nevertheless nearly optimal the issuer would gain very little by using non traditional securities instead combined with equity one debt issue without multiple layers of seniority and one warrant issue without multiple exercise prices suffice to achieve near optimality the near optimality of traditional financing depends crucially on the issuer s ability to use war rants in addition to debt and equity

option listing and stock returns abstract this article examines the effect of option introductions on the underlying stocks in addition to the price increase and volatility decrease that take place when new options are listed we obtain and explain the following new empirical results i an increase in the value of the market around the listing dates of new options ii an increase in the value of an industry index which excludes the optioned stocks iii the dissipation of the price and volatility effects in recent periods and iv the existence of an announcement effect in one subperiod of our sample and its dissipation in recent periods

supply response and the dispersion of price expectations nomic an0lysis is the implication of aggregation when doing market studies the conditions for exact aggregation under a variety of definitions and settings have been studied paris and rausser theil the focus of this paper is on supply response in agriculture several authors have studied the effects of and tests for differential supply response coefficients across individuals or areas when aggregating firms e g theil p 567 here these coefficients are assumed to be identical for every firm but another problem is examined when uncertainty is present it is well documented that farmers have diverse price expectations e g bessler the question occurs as to the effects of such different expectations on aggregate supply response it is found that the curvature of the supply function is a crucial component of the analysis for example if the supply function is strictly concave an increase in the dispersion of expectations will reduce supply in aggregate

government policies and farm size does the size concept matter this paper employs a panel data set of 48 states from 1960 to 1996 to investigate the relationships of government policies public agricultural research and development r d extension and government commodity program payments to changes in farm size five different farm size measures are considered acres operated per farm real land and building value per farm real cash receipts per farm real cash receipts plus government payments per farm and an imputed measure of the real capital service flow per farm in order to make a more general statement about the impacts of government policies on farm size it was found that the impacts of government policies on farm size are in general robust to the measure of farm size considered more specifically it was found that r d extension and government payments all have positive effects on farm size

how good are standard debt contracts stochastic versus nonstochastic monitoring in a costly state verification environment the authors investigate ex ante efficient contracts in an environment in which implementation is costless in this environment standard debt contracts will typically not be optimal optimal contracts may involve defaults even in states in which the borrower is fully able to repay the authors then examine the welfare costs of arbitrarily restricting the set of feasible contracts to standard debt contracts when model parameters are calibrated to realistic values the welfare loss from exogenously imposing this restriction is extremely small thus if implementation costs are actually nontrivial as seems likely standard debt contracts will be very close to optimal copyright 1994 by university of chicago press

the evolution of aquaculture in african rural and economic development abstract in africa aquaculture has developed only recently and so far has made only a small contribution to economic development and food security we review developments and identify constraints to the expansion of aquaculture in economic and rural development at the continental national and farm levels past development initiatives failed to achieve sustainable increases in production in contrast a growing number of smallholder farmers in many countries have been adopting and adapting pond aquaculture to their existing farming systems and slowly increasing their production efficiency an evolutionary approach that builds on a fusion of local and outside participation in technology development and transfer appears more likely to produce fish production systems that are more productive and more environmentally and socially sustainable in the long term

estimating labor supply and production decisions of self employed farm producers abstract this paper proposes a model oriented towards integrating farm households production and consumption decisions into a unified theoretical and econometric framework it is argued that in contrast with other forms of economic organization farm households utility and profit maximization decisions are not likely to be independent econometric estimation of a farm household model using canadian data suggests that utility and profit maximizing decisions are not indeed independent and moreover that there are significant gains in explanatory power and efficiency by estimating the consumption and production equations jointly

supply and demand functions for multiproduct u s cash grain farms biases caused by research and other policies this study presents new estimates of supply and demand elasticities for u s multiproduct cash grain farms and estimates of input and output bias effects caused by public and private crop research extension and farmers schooling the study also shows that the social rate of return to public crop research is large about 62 percent

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

world agricultural futures regional sustainability and ecological limits there is a wide spectrum of views on possible futures for world agriculture with a clear division between neoclassical and ecological economics approaches to the issue an incremental approach characteristic of neoclassical economics focuses on steady yield increases as a result of technological progress and increased input use in this view there are no inherent limits to growth and therefore an optimistic view tends to be taken of future production potential by contrast an analysis based on the concept of carrying capacity emphasizes environmental limits to system growth this paper reviews estimates of carrying capacity as well as trends in land use yields and environmental impacts of agriculture demand projections are made for the year 2025 based on population momentum and a slow rate of increase in per capita consumption the global system is seen to be approaching carrying capacity limits over the next 30 years with more severe stresses at a regional level and widening food deficits in developing nations strong yield growth in china south asia africa north america and europe will be necessary to avert global shortfalls but resource and environmental factors pose serious constraints in all these areas the pressure to increase yields is therefore in conflict with the requirements of long term sustainability this indicates the need for regional models of sustainable agro ecosystems which balance yield requirements with ecological constraints in addition demand side issues of population policy efficiency in consumption and distributional equity become increasingly important in a world of constrained agricultural growth

intellectual property rights and the welfare effects of agricultural r d the profound changes that have affected agriculture in modern times are perhaps best illustrated by the evolution of production techniques due to mechanization new chemical inputs such as herbicides pesticides and fertilizers genetic selection of crops and animals new crop varieties and countless other technical and organizational improvements these innovations have allowed a generalized increase in physical output while at the same time agriculture has suffered a massive exodus of labor forces towards the non farm sectors indeed a stylized fact of developed countries post war growth is that productivity in agriculture has grown faster than in other sectors jorgenson and gollop 1992 this remarkable record naturally begs the question of what is at its root and a view that commands considerable consensus is that agricultural productivity growth is due to past investments in scientific research and development r d

productivity across industries and countries time series theory and evidence the authors examine whether convergence in aggregate productivity is also occurring at the industry level in fourteen oecd countries from 1970 to 1987 using both cross section and time series methods they find convergence in some sectors such as services however surprisingly the authors find that convergence does not hold for the manufacturing sector decomposing aggregate convergence into industry productivity gains and changing sectoral shares of output they find the service sector to be responsible for the bulk of cross country convergence to the united states the authors develop a new result on the asymptotic normality of panel unit root estimators to formally test within sector convergence copyright 1996 by mit press

how reliable is duality theory in empirical work the neoclassical theory of production establishes a dual relationship between the profit value function of a competitive firm and its underlying production technology this relationship commonly referred to as duality theory has been widely used in empirical work to estimate production parameters such as elasticities and returns to scale we generate a pseudo dataset by monte carlo simulations which starting from known production parameters yield a dataset with the main characteristics of u s agriculture in terms of unobserved firm heterogeneity decisions under uncertainty unexpected production and price shocks endogenous prices output and input aggregation measurement error in variables and omitted variables production parameters are not precisely recovered when performing econometric estimation based on the duality approach and the elasticity estimates are inaccurate deviations of own and cross price elasticities from initial median values given our parameter calibration range between 6 and 690 with an average of 90 also own price elasticities are as imprecisely recovered as cross price elasticities sensitivity analysis shows that results still hold for different sources and levels of noise and sample size used in estimation

liquidity maturity and the yields on u s treasury securities the efrect8 of aaaet liquidity on expected retuma for ts with infinite maturities toc ka are eumined for bonda treuury notes and bills with matched maturities of lellll than 6 months the yield to maturity ill higher on notes which have lower liquidity the yield di1ferential between notes and billa is a decreuing and convex function of the time to maturity the results provide a robult confirmation of the liquidity effect in auet pricing this paper studies empirically the effects of the liquidity of capital assets on their prices amihud and mendelson 1986 1989 proposed that liquidity affects asset prices because investors require a compensation for bearing transaction costs transaction costs paid whenever the asset is traded form a sequence of cash outflows the discounted value of this cost stream proxies for the value 1088 due to illiquidity which lowers the asset s value for any given cash flow that the asset generates 1 as a result the return on assets should be an increasing function of their illiquidity other things equal for stocks the illiquidity effect is expected to be strong because their transaction cost sequence is infinite amihud and mendelson 1986 1989 demonstrated that common stocks with lower liquidity yielded significantly higher average returns after controlling for risk and for other factors these results on the importance of liquidity in the pricing of stocks raise additional questions i does the liquidity effect depend on the specific controls used by amihud and mendelson 1986 1989 1 ii does illiquidity have a similarly strong effect on the pricing of bonds whose maturities are finite and iii if liquidity affects bond yields how is this effect related to the bond s time to maturity

dynamic factor demand equations in u s and canadian agriculture abstract this research provides one of the first empirical estimates of a data based dynamic factor demand model for american and canadian agriculture models such as these deserve more widespread use in the empirical analysis of agriculture these models have the advantage that they do not impose inappropriate dynamics on the data rather they permit the data to select the appropriate dynamics we use a model originally developed by anderson and blundell this model is a general first order dynamic model which contains as testable hypothesis several simpler models this model permits us to estimate the long run agricultural production structure as a subset of the dynamic parameter estimates we will test this long run structure for symmetry homotheticity and neutral technical change the estimated models may be used to test for three alternative dynamic structures in the limit dynamics may not be needed and we can test for the static long run equilibrium model two intermediate cases are the autoregressive and the partial adjustment models which are simpler than the general model but still include dynamics our results suggest that the long run equilibrium model is unsatisfactory in both countries a dynamic model is needed in both countries the two more restricted dynamic models are rejected the general dynamic model is required in canada the long run equilibrium structure is homothetic with neutral technical change in the united states homotheticity is also accepted but neutral technical change is rejected

the price effect of option introduction this paper examines the price effect of option introduction from 1974 to 1980 the introduction of individual options causes a permanent price increase in the underlying security beginning approximately three days before introduction the price effect appears to be associated with introduction and not announcement throughout the sample period excess returns volatility declines with option introduction systematic risk is unchanged there is a positive relation between the price increase and a measure of activity in the options market copyright 1989 by american finance association

supply demand and technology in a multiproduct industry texas field crops the purpose of this paper is to examine the structure of agricultural production for six texas field crops cotton grain sorghum wheat corn rice and hay which account for nearly 95 of recent field crop value specific objectives are to a test the structure of technology to determine i if output and input utilization choices for individual products are independent of production decisions about other outputs and ii if products and or inputs can be consistently aggregated b estimate a coherent set of interrelated supply functions for the six commodities and input demand functions for fertilizer and hired labor because the empirical focus of this paper is specific to one state the results will be of limited value for interpreting specific production relationships elsewhere however the problem is of common interest in production agriculture and the techniques used demonstrate an important application of dual modeling

efficiency effects of agricultural economics research in the united states allocations of research funds across programs are often made for efficiency reasons social science research is shown to have small lagged but significant effects on u s agricultural efficiency when public agricultural r d and extension are simultaneously taken into account farm management and marketing research variables are used to explain variations in estimates of allocative and technical efficiency using a bayesian approach that incorporates stylized facts concerning lagged research impacts in a way that is less restrictive than popular polynomial distributed lags results are reported in terms of means and standard deviations of estimated probability distributions of parameters and long run total multipliers extension is estimated to have a greater impact on both allocative and technical efficiency than either r d or social science research

optimal monitoring policies in agencies this article considers a principal agent problem in which the principal has access to a costly monitoring technology that can be used to acquire additional information about the agent s actions subsequent to observing the agent s output although randomized monitoring policies are feasible we show that in a variety of contexts optimal monitoring policies are deterministic and lower tailed that is there exists some critical level of output such that further investigation of the agent s actions occurs if and only if output falls below this critical level

productivity growth in indian agriculture is there evidence of convergence across states this paper explores the question of convergence in total factor productivity tfp in agriculture across fourteen major agricultural states of india using a tornqvist theil index for tfp growth for the period 1973 1993 we find no evidence to support convergence to a single tfp level convergence after grouping the various states on the basis of their productivity performance we find that the high performing states show a gradual movement towards the trend whereas the low performing states generally show more volatility testing for long run convergence in levels of agricultural productivity we find evidence of conditional beta convergence after controlling for state specific factors and idiosyncratic year specific volatility the results are robust to alternative specifications of tests of unit root in panel data developed recently

research and productivity in mexican agriculture partial and total factor productivity tfp measures of mexican agriculture are calculated for 1960 90 the long run effects of research and international transfer of technology on tfp are examined over the 1940 90 period using cointegration procedures tfp increased at an average annual rate of 2 5 exceeding the corresponding growth in the united states 2 1 tfp grew particularly fast in the 1960s and 1970s a 1 rise in research investment increased tfp by 0 13 and a 1 increase in u s tfp translated into a 1 11 increase in mexican tfp the average annual rate of return to research investment is about 64

justifying the first order approach to principal agent problems it is of interest to know when the incentive compatibility conditio n in principal agent problems can be replaced by the condition that the agent s expected utility be stationary in effort the mirrlees rogerson conditions do not work if the principal can observe more than one observable statistic also the mirrlees rogerson assumption that the distribution function of output is convex in the agent s action is unsatisfactory even in the context of the basi c model it is too restrictive the paper presents a suite of conditio ns that are applicable to the multistatistic case and replaces the objectionable convex distribution function assumption copyright 1988 by the econometric society

agricultural research expenditures in the united states a public goods perspective this paper presents econometric evidence on two different public good formulations of agricultural research pure public and joint product models a nested test for simultaneous equations is proposed and applied for distinguishing between the two models the procedure is used for testing for neutrality using data from 1951 85 the authors illustrate the technique with two stage least squares estimates for forty eight u s states an overwhelming number of sample states abide by the joint product model price and full income elasticities are presented copyright 1994 by mit press

output response to prices and public investment in agriculture indonesian food crops abstract this paper analyzes dynamic food crop supply response in indonesia the effects of technology prices and investments on output growth for rice corn soybean and cassava are examined the analysis generates crop wise area yield and input demand parameters suitable for the evaluation of price and investment policies and shows the large impact of public investment in agricultural research extension and irrigation on long run output growth in indonesia elimination of the fertilizer subsidy and reinvestment of the resulting fiscal savings in research extension and irrigation would produce large benefits

the two dimensions of policy impacts on economic cohesion concept and illustration for the cap abstract given the growing importance of cohesion policy within the european union eu during the last two decades public and scientific interest in the role of eu policies for regional disparities has risen continuously recent empirical studies on the impacts of the common agricultural policy cap on economic cohesion have been strikingly diverse in their principal findings whereas some studies suggest positive overall effects on economic cohesion others stress exactly the opposite one major reason for the ambiguous results is that a single agreed upon measure of economic cohesion is lacking we propose a concept that distinguishes between two dimensions of policy impacts on economic cohesion i the redistributive impact at a defined period of time and ii the change of the redistributive impact over time the first dimension addresses the question whether a policy makes the distribution of a target variable e g income more equal or unequal at one point of time the second dimension covers the impact of the policy on the disparity of the same variable over time i e the impact on convergence an empirical illustration of the concept for 13 nuts 1 regions in germany over the period 1991 2009 reveals that the two policy impacts of the cap are partly contradictory for the two dimensions it is shown that the cap fosters economic cohesion by reducing regional disparities in each individual year with regard to redistributive impacts over time we find that cap transfers leave income convergence largely unaffected for society as a whole within the agricultural sector it leads to a convergence of receipts per farm whereas it induces a divergence of farm receipts per hectare

asset pricing puzzles and incomplete markets the representative agent theory of asset pricing is modified to incorporate heterogeneous agents and incomplete markets the model features two types of agents who differ up to a nontradable idiosyncratic component in their endowment processes numerical solutions indicate that individuals are able to diversify a substantial portion of their idiosyncratic income risk through riskless borrowing and lending alone restrictions on the variability of intertemporal marginal rates of substitution hansen and jagannathan 1991 are used to argue that incomplete markets as modeled here cannot account for the properties of asset returns that are anomalous from the perspective of representative agent theory a large literature in financial economics has investigated the extent to which variants of the lucas 1978 general equilibrium theory of asset pricing can account for the joint behavior of aggregate u s consumption and asset returns by and large this literature has concluded that a theory based upon frictionless arrow debreu markets and or a representative agent makes strongly counterfactual predictions regarding even the simple unconditional properties of this relationship mehra and prescott 1985 for instance show that the theory drastically underpredicts the average excess rate of return on u s stocks the so called equity premium puzzle weil 1989 points out as did mehra and prescott that the magnitude of the average risk free rate is far below that predicted by the theory this has been dubbed the risk free rate puzzle numerous authors including grossman melino and shiller 1987 and backus gregory and zin 1989 show that the theory cannot account for term premia inherent in the yield curve hodrick 1987 surveys a large literature which documents the theory s shortcomings in accounting for excess expected returns in foreign exchange markets the notion that the representative agent model cannot account for excess returns across a wide array of asset markets can be made more precise by using tools developed by hansen and jagannathan 1991 and shiller 1982

is there a pecking order evidence from a panel of ipo firms abstract we test the pecking order model of capital structure by examining the financing of firms that went public in 1983 we estimate a logit to predict external financing and a multinomial logit to predict the type of financing using data on the ipo firms security offerings during 1984 1992 our results indicate that the probability of obtaining external funds is unrelated to the shortfall in internally generated funds although firms with cash surpluses avoid external financing firms that access the capital markets do not follow the pecking order when choosing the type of security to offer

multiple input multiple output production choices and technology in the u s wheat region duality theory motivates a translog expected profit function consistent with multiple products price uncertainty preseason climate constraints acreage control policies and possibly nonhomothetic technology although multiple outputs are allowed enterprise specific data is not necessary instead time series measures of output revenues and expected prices input expenses and prices and fixed input flows are employed appropriate measures of elasticities of choice returns to size and biases in technological change are derived results indicated decreasing returns to size rather limited though complementary responsiveness of choices to price changes and the nature of biases in technological changes

capital services in u s agriculture concepts comparisons and the treatment of interest rates this paper begins with a review of the methods and assumptions used to measure capital service flows two data series on capital inputs in u s agriculture are briefly described and compared we show that measures of capital services are sensitive to the treatment of interest rates notably the use of fixed versus variable market rates significantly affects measures of the quantity and productivity of agricultural capital in the united states we conclude that when calculating capital usage in u s agriculture the use of a fixed interest rate generates more plausible estimates than the use of an annual market rate

modelling technical change in italian agriculture a latent variable approach this paper presents an alternative approach to the measurement of technical change it is based on the latent variable level of technology that enters explicitly the input demand system and on a hypothesis about the innovation generating process by adding measurement error equations the behavioral system can be viewed as a multiple indicators multiple causes mimic model the parameter estimates are obtained with a maximum likelihood estimator which involves the implicit covariance matrix the analysis refers to italian agriculture and the results provide some evidence on the nature and level of technical change during the years 1961 1991

spatial disparities in the european agriculture a regional analysis this article examines the territorial imbalances in european agriculture during the period 1980 to 2001 by means of the information provided by various methodological instruments which allow us to overcome the drawbacks of conventional convergence analysis the results obtained reveal that the regional distribution of productivity in the agricultural sector is characterized by the presence of positive spatial dependence this fact implies that the european regions in close spatial proximity register similar levels of the variable under study which highlights the relevance of geographical location in this context the empirical evidence presented also shows that regional disparities have remained almost constant during the time interval considered however the increase in density around the european average explains the observed reduction in the degree of bipolarization while intra distribution mobility is relatively limited finally the analysis carried out allows us to assess the role of variables s

the incentive to give incentives on the relative seniority of debt claims and managerial compensation abstract we show that the relative seniority of debt and managerial compensation has important implications for the design of remuneration contracts whereas the traditional literature assumes that debt is senior to remuneration there are in reality many cases in which remuneration contracts are de facto senior to debt claims in financially distressed firms and in workouts we theoretically show that risky debt changes the incentive to provide the manager with performance related incentives a contract substitution effect in other words the relative degree of seniority of managers claims and creditors claims in case a bankruptcy procedure starts is crucial to determine the optimal incentive contract ex ante if managerial compensation is more senior than debt higher leverage leads to lower power incentive schemes lower bonuses and option grants and a higher base salary in contrast when compensation is junior we expect more emphasis on pay for performance incentives in highly levered firms

consumption patterns and their effects on land required for food abstract vast amounts of land are required for the production of food but the area suitable for growing crops is limited in this paper attention is paid to the relationship between food consumption patterns and agricultural land requirements land requirements per food item that were determined in a previous study are combined with data on the per capita food consumption of various food packages varying from subsistence to affluent leading to information on land requirements for food large differences could be shown in per capita food consumption and related land requirements while food consumption expenditure and the physical consumption of specific foods change rapidly over time a difference of a factor of two was found between the requirements for existing european food patterns while the land requirement for a hypothetical diet based on wheat was six times less than that for an existing affluent diet with meat it is argued that in the near future changes in consumption patterns rather than population growth will form the most important variable for total land requirements for food trends towards the consumption of foods associated with affluent lifestyles will bring with them a need for more land lifestyle changes changes in consumer behavior on a household level can be considered as powerful options to reduce the use of natural resources such as agricultural land

environmental sustainability in agriculture diet matters abstract there is no agreement that diet matters for environmental sustainability in the agriculture sector much current agriculture is unsustainable and worsening the environmental impact of agriculture degrades natural capital e g loss of topsoil waste and pollution of water nutrient loss extinction of species cattle raising is one of the most damaging components of agriculture livestock now eat about half of global grain production there is limited scope for improving food supply and what scope there is will further damage the environment all means to improve nutrition especially for the poor will be needed as population increases one such means is to improve diets of the rich by eating lower down the food chain while most people in the world thrive on mainly grain based diets carnivory is high in oecd and is increasing in ldcs in order to reduce food wastage and to improve health and food availability a food conversion efficiency tax is proposed the least efficient converters pork beef would be highly taxed more efficient converters poultry eggs dairy would be moderately taxed most efficient converters ocean fish would be taxed lowest grain for human food would not be taxed while coarse grains might be modestly subsidized non food agriculture also would be taxed highest on tobacco and on starches destined for alcoholic beverages produced from land suitable for food production

the nature of agricultural systems food security and environmental balance abstract global food security in the future will depend on growth in production in those areas of the world with favourable soils adequate water resources and high yields from wheat and rice cropping because the area devoted to rice and wheat cultivation in these favourable conditions has been stagnant or declining since the 1980s with little prospect for reversing the trend increases in grain production must come from increases in yield per hectare to achieve the needed increases in yields of basic food grains a broad range of constraints facing existing production systems must be removed additional inputs for crop production are needed and new technologies which have yet to be developed are essential for managing crop nutrients pests and diseases under normal economic conditions optimal farm management of high intensity agriculture produces grain yields that approach 80 of the technical ceiling achieved on experimental plots as asian farmers approach this 80 limit pushing out the technical yield ceiling will be crucial for maintaining growth in cereal yields into the 21st century if management practices focus on short run profitability rather than on long run sustainability the challenge to scientists seeking to raise yield potential becomes more complex because of the deteriorating soil environment in which crops are grown most of the agricultural land in the developing world has less favourable endowments of soil and water resources than do the high productivity farming areas of asia these regions are home to the majority of the world s poor developments in production ecology suggest that significant improvement is possible in the management of biological processes that govern the efficiency and sustainability of the agricultural systems that dominate in these poorly endowed areas but a substantial investment in research for crop production will be required

risk aversion performance pay and the principal agent problem this paper calculates numerical solutions to the principal agent problem and compares the results to the stylized facts of ceo compensation the numerical predictions come from parameterizing the models of grossman and hart and of holmstrom and milgrom while the correct incentives for a ceo can greatly enhance a firm s performance providing such incentives need not be expensive for many parameter values ceo compensation need increase only by about 10 for every 1 000 of additional shareholder value for some values the amount is 0 003 cents

what can we learn from simulating a standard agency model abstract for typical parametrizations of the standard bell journal of economics 10 1979 74 agency model this paper demonstrates that the set of first order conditions characterizing the optimal contract can be reduced to a single equation a problem of investment financing under moral hazard is used to illustrate the reduced form equation s usefulness in quantitative applications when the agent has cara preferences over consumption it is shown that any exogenous limit on the penalties for low output is always binding

investment incentives debt and warrants abstract this paper models and characterizes investment incentive problems associated with debt financing the decision problem of residual claimants is explicity formulated and their investment policies are characterized the paper also analyzes the use of conversion features and warrants to control distortionary incentives these claims reverse the convex shape of levered equity over the upper range of the firm s earnings and this mitigates the incentive to take risk it is shown that under certain conditions such claims can be constructed to restore net present value maximizing incentives and simultaneously meet the financing requirements of the firm

linearity with project selection and controllable diffusion rate in continuous time principal agent problems i extend holmstrom and milgrom s model by allowing the agent to control privately or publicly the diffusion rate process and show that the optimal contract is still linear i discuss the conditions under which conflicts over the choice of diffusion rate do and do not arise as an application i examine project selection problems of a firm conflicts between the manager and investors arise because giving the manager too much incentive to work to increase the profit from ongoing operations can induce him to be too conservative in project selection possibly resulting in optimal contracts with low sensitivities

piecewise linear incentive schemes general outlook and stabilization theories and policies of piecewis e linear incentive schemes are studied in a setting of moral hazard and adverse selection the form of the best such function is analyzed particular attention is given to the loss from using piecewise linear schemes relative to optimal schemes as well as the gain from usin g simpler functional forms such as the linear functions the incentive problem is studied under various informational assumptions which allow some calculations of the value of information copyright 1988 by the editors of the scandinavian journal of economics

convergence in u s productivity growth for agriculture implications of interstate research spillovers for funding agricultural research state crop livestock and aggregate agricultural total factor productivity tfp data 1950 82 are examined for evidence of convergence to a single tfp level convergence or to a steady state rate of growth or conditional convergence our empirical results do not support convergence but do support convergence the rate of convergence is variable and depends on research and development r d spillins from other states private r d and farmers schooling the finding of strong positive interstate spillover effects implies that independent state planning of agricultural research is inefficient and cooperation across states boundaries including establishment of new political jurisdictions for financing public agricultural research can enhance efficiency

the benefits of lending relationships evidence from small business data this paper empirically examines how ties between a firm and its creditors affect the availability and cost of funds to the firm we analyze data collected in a survey of small firms by the small business administration the primary benefit of building close ties with an institutional creditor is that the availability of financing increases we find smaller effects on the price of credit attempts to widen the circle of relationships by borrowing from multiple lenders increases the price and reduces the availability of credit in sum relationships are valuable and appear to operate more through quantities rather than prices

induced innovation in u s agriculture time series direct econometric and nonparametric tests the hypothesis of induced innovation is tested for u s agriculture using a high quality state level panel data set and three disparate testing techniques time series direct econometric and nonparametric we find little support for the hypothesis that conclusion is robust across testing techniques however as with all empirical tests of this hypothesis conducted to date ours focus only on the demand side of the hypothesis the hypothesis could have been rejected simply because the marginal cost of developing and implementing input saving technologies for the relatively expensive inputs is greater than for the relatively cheap inputs copyright 2009 oxford university press

an analysis of the principal agent problem most analyses of the principal agent problem assume that the principal chooses an incentive scheme to maximize expected utility subject to the agent s utility being at a stationary point an important paper of mirrlees has shown that this approach is generally invalid we present an alternative procedure if the agent s preferences over income lotteries are independent of action we show that the optimal way of implementing an action by the agent can be found by solving a convex programming problem we use this to characterize the optimal incentive scheme and to analyze the determinants of the seriousness of an incentive problem

carrying capacity in agriculture global and regional issues abstract much of the debate over world agricultural futures centers on the issue of yield growth optimists in the field base their analyses on a technology and input driven rate of increase in yields which they argue has outpaced population growth and will continue to do so leaving a margin for steady increase in per capita incomes those who are sometimes classified as pessimists we prefer the term ecological realists see practical limits to global and regional carrying capacity in agriculture and maintain that the world is close to or may even have passed these limits projections for world agriculture in the first half of the twenty first century vary widely largely depending on assumptions on yield growth we investigate the pattern of yield growth for major cereal crops and present evidence that the growth pattern is logistic not exponential this pattern is consistent with ecological limits on soil fertility water availability and nutrient uptake projections for supply and demand in the twenty first century based on a logistic rather than an exponential model of yield growth imply that the world is indeed close to carrying capacity in agriculture and that specific resource and ecological constraints are of particular importance at the regional level a supply side strategy of increased production has already led to serious problems of soil degradation and water overdraft as well as other ecosystem stresses this implies that demand side issues of population policy and efficiency in consumption are crucial to the development of a sustainable agricultural system