state versus federal environmental regulation in a non cooperative monopoly screening model abstract a multiple principal monopoly screening model is presented in which two regulators act as rivals when setting a menu of contracts composed of a two part pricing scheme and design standard state and federal environmental regulation are modeled we show that the firm prefers federal environmental regulation because the design standards are more stringent this preference for stricter control occurs because higher standards generate higher information rents for the firm

impact of off farm income on food security and nutrition in nigeria abstract while the poverty implications of off farm income have been analyzed in different developing countries much less is known about the impact of off farm income on household food security and nutrition here this research gap is addressed by using farm survey data from nigeria econometric analyses are employed to examine the mechanisms through which off farm income affects household calorie and micronutrient supply dietary quality and child anthropometry we find that off farm income has a positive net effect on food security and nutrition the prevalence of child stunting underweight and wasting is lower in households with off farm income than in households without using a structural model we also show that off farm income contributes to higher food production and farm income by easing capital constraints thus improving household welfare in multiple ways

a theory of corporate financial decisions with liquidity and solvency concerns this paper studies the impact of both liquidity and solvency concerns on corporate finance i present a tractable model of a firm that optimally chooses capital structure cash holdings dividends and default while facing cash flows with long term uncertainty and short term liquidity shocks the model explains how changes in solvency affect liquidity and also how liquidity concerns affect solvency via capital structure choice these interactions result in a dynamic cash policy in which cash reserves increase in profitability and are positively correlated with cash flows the optimal dividend distributions implied by the model are smoothed relative to cash flows i also find that liquidity concerns lead to a decrease of dispersion of credit spreads

tradeoffs and complementarities in the adoption of improved seeds fertilizer and natural resource management technologies in kenya there is widespread consensus that agricultural technology has an important role to play for poverty reduction and sustainable development there is no consensus however about the types of technologies that are best suited for smallholder farmers in africa while some consider natural resource management nrm technologies as most appropriate others propagate input intensification with a stronger role of the private sector in the public debate these two strategies are often perceived as incompatible environmental non governmental organizations in particular consider low external input strategies as the only sustainable form of agriculture a view that has considerable influence on policymakers and the international donor community most existing research studies on smallholder innovation focus on the adoption of individual technologies so that comparisons between different types of technologies in the same context are not easily possible we use representative data from maize producing households in kenya and a multivariate probit model to analyze the adoption of different types of technologies simultaneously results indicate that nrm technologies and strategies that build on external inputs are not incompatible interesting complementarities exist which are not yet sufficiently exploited because many organizations promote either one type of technology or the other but rarely a combination of both

impact of modern agricultural technologies on smallholder welfare evidence from tanzania and ethiopia this paper evaluates the potential impact of adoption of improved legume technologies on rural household welfare measured by consumption expenditure in rural ethiopia and tanzania the study utilizes cross sectional farm household level data collected in 2008 from a randomly selected sample of 1313 households 700 in ethiopia and 613 in tanzania the causal impact of technology adoption is estimated by utilizing endogenous switching regression this helps us estimate the true welfare effect of technology adoption by controlling for the role of selection problem on production and adoption decisions our analysis reveals that adoption of improved agricultural technologies has a significant positive impact consumption expenditure in per adult equivalent terms in rural ethiopia and tanzania this confirms the potential role of technology adoption in improving rural household welfare as higher consumption expenditure from improved technologies translate into lower poverty higher food security and greater ability to withstand risk an analysis of the determinants of adoption highlighted inadequate local supply of seed access to information and perception about the new cultivars as key constraints for technology adoption

costly arbitrage evidence from closed end funds arbitrage costs lead to large deviations of prices from fundamentals using a sample of closed end funds i find that the market value of a fund is more likely to deviate from the value of its assets 1 for funds with portfolios that are difficult to replicate 2 for funds that pay out smaller dividends 3 for funds with lower market values and 4 when interest rates are high these factors are related to the magnitude of the deviation as opposed to the direction i e whether discount or premium and explain a quarter of cross sectional mispricing variation these findings are consistent with noise trader models of asset pricing

strategic price complexity in retail financial markets abstract there is mounting empirical evidence to suggest that the law of one price is violated in retail financial markets there is significant price dispersion even when products are homogeneous also despite the large number of firms in the market prices remain above marginal cost and may even rise as more firms enter in a non cooperative oligopoly pricing model i show that these anomalies arise when firms add complexity to their price structures complexity increases the market power of the firms because it prevents some consumers from becoming knowledgeable about prices in the market in the model as competition increases firms tend to add more complexity to their prices as a best response rather than make their disclosures more transparent because this may substantially decrease consumer surplus in these markets such practices have important welfare implications

social networks and technology adoption in northern mozambique despite their potentially strong impact on poverty agricultural innovations are often adopted slowly using a unique household dataset on sunflower adoption in mozambique we analyse whether and how individual adoption decisions depend upon the choices of others in the same social networks since farmers anticipate that they will share information with others we expect farmers to be more likely to adopt when they know many other adopters dynamic considerations however suggest that farmers who know many adopters might strategically delay adoption to free ride on the information gathered by others we present empirical evidence that shows that the relationship between the probability of adoption and the number of known adopters is shaped as an inverse u in line with information sharing the network effect is stronger for farmers who report discussing agriculture with others the data contains information which is needed to ameliorate the identification issues that commonly arise in this context in particular social networks are precisely identified and in addition we can control for village heterogeneity and endogenous group formation

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

toward a political theory of the emergence of environmental incentive regulation this article makes some steps toward a formal political economy of environmental policy economists quasi unanimous preference for sophisticated incentive regulation is reconsidered we recast the question of instrument choice in the general mechanism design literature within an incomplete contract approach to political economy we show why constitutional constraints on the instruments of environmental policy may be desirable even though they appear inefficient from a standard economic viewpoint their justification lies in the limitations they impose on the politicians ability to distribute rents insights are provided on the emergence of incentive mechanisms in environmental regulation

pollution claim settlements reconsidered hidden information and bounded payments abstract a principal s production decision imposes a negative externality on an agent the principal may be a pollution generating firm the agent may be a nearby town the principal offers a contract to the agent who has the right to be free of pollution then the agent privately learns the disutility of pollution finally a production level and a transfer payment are implemented suppose there is an upper bound possibly zero on payments that the agent can make to the principal in the second best solution there is underproduction for low cost types while there is overproduction for high cost types in contrast to standard adverse selection models of pollution claim settlements there may thus be too much pollution compared to the first best solution

product market competition and analyst forecasting activity international evidence abstract in this study we investigate how product market competition affects the extent of analyst following and the properties of analyst forecasts using a broad sample of firms from 37 countries over the 1990 2008 period we find that firms that operate in more concentrated industries and with stronger pricing power are associated with greater analyst following higher forecast accuracy and lower forecast dispersion moreover the effect of product market power on analyst following and forecast properties is more pronounced in countries with less effective competition laws and higher entry costs these findings suggest that high industry concentration and a dominant market position enhance the earnings predictability of firms and lower their information uncertainty and that country level institutions that promote competition effectively constrain the power in product markets

agriculture in africa telling myths from facts a synthesis stylized facts drive research agendas and policy debates yet robust stylized facts are hard to come by and when available often outdated in a special issue of food policy 12 papers revisit conventional wisdom on african agriculture and its farmers livelihoods using nationally representative surveys from the living standards measurement study integrated surveys on agriculture initiative in six african countries at times the findings simply confirm the common understanding of the topic but the studies also throw up several surprises redirecting some policy debates while fine tuning others overall the project calls for more attention to checking and updating the common wisdom this requires nationally representative data and sufficient incentives among researchers and policy makers alike without well grounded stylized facts they can easily be profoundly misguided

second best energy policies for heterogeneous firms this paper investigates second best issues in the regulation of external costs of energy use by heterogeneous firms the efficiency of regulatory energy policies depends in general on the policy incentives given for both output reduction and input substitution the resulting endogeneity of firms supply functions appears to lead to complicated policy rules in contrast to earlier efforts the analysis considers an arbitrarily large number of non identical price taking firms in a joint market a large variety of possible production functions including varying levels of economies of scale and possibilities for input substitution and elasticities of market demand which may vary from completely elastic to completely inelastic two second best instruments are considered namely output taxes and energy efficiency standards and are compared to the benchmark of first best energy taxes the underlying market factors determining the relative efficiency of these second best instruments when used optimally are identified

conservation agriculture organic marketing and collective action in the honduran hillsides conservation agriculture ca is often perceived to provide win win outcomes for farmers leading to reduced erosion and off site sedimentation as well as improved soil fertility and productivity however adoption rates for ca in many regions of the world remain below expected levels this article looks at the effects of participation in organic markets and farmers organizations on the adoption of soil conservation practices based on original survey data from 241 small scale farm households in honduras we find that both participation in organic markets and farmer based groups have positive effects on the number of soil conservation practices adopted the results indicate that besides supply oriented policy measures such as the provision of technical assistance and extension demand related factors are likely to play an important role in sustainable soil management demand oriented policy measures include support for labeling initiatives and consumer education to facilitate value added product differentiation and market segmentation jel classifications q01 q12 q13 q16

environmental innovation policy and international competition we consider one polluting industry in an open economy the national government implements a policy of industrial pollution control by inducing appropriate technological innovation to reduce toxic emissions the emission reducing innovations are developed through firm specific costly investments under different hypotheses on market structure perfect competition bertrand and cournot oligopoly international competition forces the national government to subsidize innovation the appropriate subsidy scheme varies according to the information available to the government and according to market structure if information is asymmetric the subsidy must include the information premium necessary to separate different types of firms

regulation of prices and pollution under incomplete information abstract regulation of prices and pollution for a monopolist with private information is considered with a focus on the relative efficiency of standard setting and emissions taxation approaches to pollution control with incomplete information emissions taxation is a dominated regulatory instrument for abatement purposes because it generates information costs that can be avoided when an abatement standard and prices are set by the regulator an emissions tax has value however as a means of reducing those information costs but its use for this purpose may increase pollution

an empirical equilibrium model of a decentralized asset market i estimate a search and bargaining model of a decentralized market to quantify the effects of trading frictions on asset allocations and asset prices and to quantify the effects of intermediaries that facilitate trade using business aircraft data i find that relative to the walrasian benchmark 12 4 percent of the assets are misallocated and prices are approximately 27 3 percent lower dealers play an important role in reducing frictions in a market with no dealers 15 7 percent of the assets would be misallocated perhaps surprisingly in a market with no dealers prices would increase by 2 8 percent because sellers outside options improve relative to buyers thus counteracting the effects of higher search costs and slower trade on asset prices

evidence that the zero earnings discontinuity has disappeared abstract discontinuities in earnings distributions at zero have been widely cited as evidence of earnings management but not without controversy recent research suggests discontinuities may be mere artifacts of certain research design choices we find that the well known zero earnings discontinuity disappears soon after passage of the sarbanes oxley act sox and has not returned we also find that neither the discontinuity nor its disappearance require the effects of widely cited alternative non earnings management explanations for the zero earnings discontinuity

endogeneity and the dynamics of internal corporate governance abstract we use a well developed dynamic panel generalized method of moments gmm estimator to alleviate endogeneity concerns in two aspects of corporate governance research the effect of board structure on firm performance and the determinants of board structure the estimator incorporates the dynamic nature of internal governance choices to provide valid and powerful instruments that address unobserved heterogeneity and simultaneity we re examine the relation between board structure and performance using the gmm estimator in a panel of 6 000 firms over a period from 1991 to 2003 and find no causal relation between board structure and current firm performance we illustrate why other commonly used estimators that ignore the dynamic relationship between current governance and past firm performance may be biased we discuss where it may be appropriate to consider the dynamic panel gmm estimator in corporate governance research as well as caveats to its use

why company specific risk changes over time company specific risk climbed steadily between 1962 and 1999 in the u s market but fell sharply between 2000 and 2003 this article explores the hypothesis that three factors are primarily responsible for observed changes in company specific risk changes in the market weights of riskier industries changes in the relative role of small capitalization stocks in the market and measurement error associated with changes in within industry concentration empirical tests reveal that each factor contributes to changes in company specific risk over time and that combined these three factors largely explain changes in company specific risk over the past 40 years

noncooperative regulation of a nonlocalized externality with a nonlocalized pollution externality different groups bear the costs and benefits of abatement in the case of acid rain these groups are respectively consumers in the midwest and pollutees in the northeast these groups have conflicting interests that are represented respectively by a public utilities commission and an environmental regulator we analyze a model in which the environmental protection agency acting as a von stackelberg leader regulates pollution and the public utility commission regulates the price for a monopolist that has private information about the effectiveness of its abatement alternatives we characterize a noncooperative equilibrium and compare it with a cooperative equilibrium a nonlocalized pollution externality poses special regulatory problems when the benefits and the costs of abatement are borne by distinct groups whose interests are represented by different regulatory agencies a relevant example is acid rain which is believed to be caused in part by coal fired electricity generating plants these emit sulfur dioxide and nitrogen oxide which upon contact with moisture in the atmosphere form acid that falls with rain measures to reduce these emissions are of concern to the residents of the states in which the coal fired generating plants are located because abatement costs increase the prices they pay for electricity a number of plans have been proposed for distributing those costs more broadly but the costs of reducing the emissions of generating plants located in ohio will likely be borne in large part by ohio consumers and utilities while the benefits from abatement will largely be realized by the residents of the northeast and canada the control of a nonlocalized externality such as acid rain raises the issue of the relationship between the environmental regulator the environmental protection agency epa and the public utility commission the former is responsible for achieving an acceptable balance between the damage from pollution and the cost of abatement the latter is responsible for pricing electricity on the basis of the costs of production and pollution control one possibility is that cooperation between the two regulators leads to the joint regulation of emissions and prices cooperation would internalize the conflicting interests and mandates of the regulators but the distributive consequences of the regulatory alternatives inhibit cooperation the public utility commission for example has an interest in avoiding abate

verifiable and non verifiable anonymous mechanisms for regulating a polluting monopolist abstract optimal regulation of a polluting natural monopolist must correct for both external damages and market power to achieve a social optimum existing non bayesian regulatory methods require knowledge of the demand function while bayesian schemes require knowledge of the underlying cost distribution we introduce mechanisms adapted to use less information our p rice based s ubsidy ps mechanisms give the firm a transfer that matches or approximates the incremental surplus generated each period the regulator need not observe the abatement activity or know the demand cost or damage functions of the firm all of the mechanisms induce the firm to price at marginal social cost either immediately or asymptotically

soil quality and fertilizer use rates among smallholder farmers in western kenya studies of fertilizer use in sub saharan africa have been dominated by analyses of economic and market factors having to do with infrastructure institutions and incentives that prevent or foster increased fertilizer demand largely ignoring how soil fertility status conditions farmer demand for fertilizer we apply a switching regression model to data from 260 farm households in western kenya in order to allow for the possibility of discontinuities in fertilizer demand based on a soil carbon content scc threshold we find that the usual factors reflecting liquidity and quasi fixed inputs are important on high scc plots but not on those with poorer soils external inputs become less effective on soils with low scc hence the discernible shift in behaviors across soil quality regimes for many farmers improved fertilizer market conditions alone may be insufficient to stimulate increased fertilizer use without complementary improvements in the biophysical conditions that affect conditional factor demand

the mystery of the vanishing benefits an introduction to impact evaluation this article provides an introduction to the concepts and methods of impact evaluation the author provides an intuitive explanation in the context of a concrete application the article takes the form of a short story about a fictional character s on the job training in evaluation ms speedy analyst is an economist in the ministry of finance in the fictional country of labas in the process of figuring out how to evaluate a human resource program targeted to the poor ms analyst learns the strengths and weaknesses of the main methods of ex post impact evaluation

can equity volatility explain the global loan pricing puzzle we examine whether equity volatility can explain the difference in syndicated corporate loan spreads paid by u s and european borrowers first documented by carey and nini 2007 we argue that ols estimates of the association between equity volatility and loan spreads are biased and inconsistent we suggest instrumental variables that potentially identify consistent estimates our instrumental variable results indicate that there is no statistically significant difference in loan spreads paid by u s and european borrowers and that ols estimates of the association between idiosyncratic equity volatility and corporate loan spreads are biased downward by about a factor of 5

the impact of improved maize varieties on poverty in mexico a propensity score matching approach summary this study examines the adoption of improved maize germplasm in oaxaca and chiapas in mexico it employs a propensity score matching approach to analyze the impact of the adoption of improved maize varieties on household income and poverty reduction using cross sectional data of 325 farmers from the two regions the findings reveal a robust positive and significant impact of improved maize variety adoption on farm household welfare measured by per capita expenditure and poverty reduction specifically the empirical results suggest that adoption of improved maize varieties helped raise household per capita expenditure by an average of 136 173 mexican pesos thereby reducing their probability of falling below the poverty line by roughly 19 31

the idiosyncratic volatility puzzle time trend or speculative episodes campbell lettau malkiel and xu 2001 document a positive trend in idiosyncratic volatility during the 1962 1997 period we show that by 2003 volatility falls back to pre 1990s levels furthermore we show that the increase and subsequent reversal is concentrated among firms with low stock prices and high retail ownership this evidence suggests that the increase in idiosyncratic volatility through the 1990s was not a time trend but rather an episodic phenomenon at least partially associated with retail investors results from cross sectional regressions conditional trend estimation stock split events and attention grabbing events are consistent with a retail trading effect the author 2009 published by oxford university press on behalf of the society for financial studies all rights reserved for permissions please email journals permissions oxfordjournals org oxford university press

adoption of improved wheat varieties and impacts on household food security in ethiopia this article evaluates the impact of the adoption of improved wheat varieties on food security using a recent nationally representative dataset of over 2000 farm households in ethiopia we adopted endogenous switching regression treatment effects complemented with a binary propensity score matching methodology to test robustness and reduced selection bias stemming from both observed and unobserved characteristics we expand this further with the generalized propensity score gps approach to evaluate the effects of continuous treatment on the response of the outcome variables we find a consistent result across models indicating that adoption increases food security and farm households that did adopt would also have benefited significantly had they adopted new varieties this study supports the need for vital investments in agricultural research for major food staples widely consumed by the poor and efforts to improve access to modern varieties and services policies that enhance diffusion and adoption of modern wheat varieties should be central to food security strategies in ethiopia

how can african agriculture adapt to climate change a counterfactual analysis from ethiopia we analyze the impact of different adaptation strategies on crop net revenues in the nile basin of ethiopia we estimate a multinomial endogenous switching regression model of climate change adaptation and crop net revenues and implement a counterfactual analysis households data are combined with spatial climate data we find that adaptation to climate change based upon a portfolio of strategies significantly increases farm net revenues changing crop varieties has a positive and significant impact on net revenues when coupled with water conservation strategies or soil conservation strategies but not when implemented in isolation jel q54 q56

qualitative similarity and stock price comovement abstract i introduce a method for gauging the qualitative similarity of firm specific information based on linguistic commonality in newswire text i show that this new qualitative similarity measure predicts future cross firm return correlation even after accounting for the pair s contemporaneous price comovement common exposures to systematic risk firm liquidity price index membership text volume headquarters location product similarity shared mutual fund or institutional ownership common analyst following and newswire co mentions i also demonstrate that content produced solely by journalists cannot predict an economically meaningful portion of future comovement out of sample tests confirm that knowledge of qualitative similarity can also reduce portfolio risk

idiosyncratic return volatility cash flows and product market competition over the past 40 years the volatility of the average stock return has drastically outpaced total market volatility thus idiosyncratic return volatility has dramatically increased we estimate this increase to be 6 per year consistent with an efficient market this result is mirrored by an increase in the idiosyncratic volatility of fundamental cash flows we argue that these findings are attributable to the more intense economy wide competition various cross sectional and time series tests support this idea economic competitiveness facilitates reinterpretation of the results from the cross country r2 literature as well as the us idiosyncratic risk literature jel g12 g14

market microstructure and securities values evidence from the tel aviv stock exchange abstract this paper examines the value effects of improvements in the trading mechanism selected stocks on the tel aviv stock exchange were transferred gradually from a daily call auction to a mechanism where the call auction was followed by iterated continuous trading sessions this event was associated with a positive and permanent price appreciation the cumulative average market adjusted return over a period that started five days prior to the announcement and ended 30 days after the stocks started trading by the new method was approximately 5 5 in addition we find positive liquidity externalities spillovers across related stocks and improvements in the value discovery process due to the improved trading method finally there was a positive association between liquidity gains and price appreciation

cropping system diversification conservation tillage and modern seed adoption in ethiopia impacts on household income agrochemical use and demand for labor the type and combination of sustainable agricultural practices saps adopted have a significant effect on agricultural productivity and food security this study develops a multinomial endogenous switching regression model of farmers choice of combination of saps and impacts on maize income and agrochemicals and family labor use in rural ethiopia four primary results were found first adoption of saps increases maize income and the highest payoff is achieved when saps are adopted in combination rather than in isolation second nitrogen fertilizer use is lower in the package that contains system diversification and conservation tillage third conservation tillage increased pesticide application and labor demand perhaps to compensate for reduced tillage however when it is used jointly with system diversification it does not have a significant impact on pesticide and labor use fourth in most cases adoption of a package of saps increases women workload suggesting that agricultural intensification technology interventions may not be gender neutral this implies that policy makers and other stakeholders promoting a combination of technologies can enhance household food security through increasing income and reducing production costs but need to be aware of the potential gender related outcomes

regulation asymmetric information and auditing this article analyzes a model of a regulated firm that is better informed about its cost function than is the regulator by auditing at a cost however the regulator is assumed to be able to observe the realized cost of the firm if the regulator finds that the firm had misrepresented its costs at the time at which prices were set he can order a refund to consumers in the optimal policy the regulator audits when the firm reports for pricing purposes that its costs will be high and orders a refund when the auditfinds that realized costs are lower than anticipated given the original report a separation result that obtains for an important case indicates that the initial pricing decision is independent of the auditing decision the auditing decision however depends on the price that was initially set the optimal auditing strategy is characterized and the nature of the welfare gains are identified the methodology used in the analysis involves the characterization of an equilibrium of a revelation game with an ex post observable

how important is financial risk we explore the determinants of equity price risk of nonfinancial corporations operating and asset characteristics are by far the most important determinants of risk for the median firm financial risk accounts for only 15 of observed stock price volatility furthermore financial risk has declined over the last 3 decades indicating that any upward trend in equity volatility was driven entirely by economic risk factors this explains why financial distress as opposed to economic distress was surprisingly uncommon in the nonfinancial sector during the 2007 2009 crisis even as measures of equity volatility reached unprecedented highs

impact of tissue culture banana technology on farm household income and food security in kenya while tissue culture tc technology for vegetative plant propagation is gradually gaining in importance in africa rigorous assessment of broader welfare effects for adopting smallholder farm households is lacking using survey data and accounting for selection bias in technology adoption we analyze the impact of tc banana technology on household income and food security in kenya to assess food security outcomes we employ the household food insecurity access scale hfias a tool that has not been used for impact assessment before estimates of treatment effects models show that tc banana adoption combined with improved crop management causes considerable increases in farm and household income technology adoption also reduces relative food insecurity in a significant way these results indicate that tc technology can be welfare enhancing for adopting farm households adoption should be further promoted through upscaling appropriate technology delivery systems

choosing the precision of performance metrics there is a standard trade off in compensation contracts between the provision of incentives and insurance we hypothesize that this trade off influences the precision with which firm performance is measured we find that firm outcomes are measured less precisely when chance plays a large role in these outcomes further this precision is determined through the choice of shares outstanding this has several novel implications nominal stock prices can remain constant over time and firms with unpredictable cash flows should have more shares and lower stock price levels all else equal we find evidence consistent with these implications

synergies between different types of agricultural technologies in the kenyan small farm sector abstractsustainable intensification of agriculture will have to build on various innovations but synergies between different types of technologies are not yet sufficiently understood we use repre

price based return comovement abstract similarly priced stocks move together stocks that undergo splits experience an increase in comovement with low priced stocks and a decrease in their comovement with high priced stocks price based comovement is not explained by economic fundamentals firm size or changes in liquidity or information diffusion the shift in comovement following splits is greater for large stocks high priced stocks and when investor sentiment is high in the full cross section price based portfolios explain variation in stock level returns after controlling for movements in the market and industry portfolios as well as portfolios based on size book to market transaction costs and return momentum the results suggest that investors categorize stocks based on price

investment in soil conservation in northern ethiopia the role of land tenure security and public programs abstract a double hurdle statistical analysis of 250 farms in the tigray region of ethiopia reveals different causal factors for soil conservation adoption versus intensity of use farmers reasons for adopting soil conservation measures vary sharply between stone terraces and soil bunds long term investments in stone terraces were associated with secure land tenure labour availability proximity to the farmstead and learning opportunities via the existence of local food for work ffw projects by contrast short term investments in soil bunds were strongly linked to insecure land tenure and the absence of local food for work projects public conservation campaigns on private plots reduced adoption of both stone terraces and soil bunds whereas capacity factors largely influenced the adoption decision expected returns carried more influence for the intensity of stone terrace adoption measured as metres of terrace per hectare more stone terracing was built where fertile but erodible silty soils in higher rainfall areas offered valuable yield benefits intensity of terracing was also greater in remote villages where limited off farm employment opportunities reduced construction costs these results highlight the importance of the right kind of public interventions direct public involvement in constructing soil conservation structures on private lands appears to undermine incentives for private conservation investments when done on public lands however public conservation activities may encourage private soil conservation by example secure land tenure rights clearly reinforce private incentives to make long term investments in soil conservation

comovement information production and the business cycle abstract recent theoretical research suggests that information production is a positive externality of aggregate economic activity veldkamp 2005 both the quantity and quality of information increase during periods of economic expansion and decrease during periods of contraction based on this insight we hypothesize and confirm that time varying information production drives the comovement patterns observed in stock returns we examine stock return comovement in 36 countries from 1980 to 2007 and show that consistent with the theory comovement patterns are countercyclical that is when information production is high low comovement is low high we also find that the relation between comovement and the business cycle is stronger in countries that experience large intertemporal swings in information production finally we show that the relation between business cycle and comovement is stronger in poor countries countries with less developed financial markets and countries with weaker accounting and transparency standards these results suggest that financial development and transparency are conducive to a steady flow of financial information over the business cycle

why have measures of earnings quality changed over time the properties of earnings have changed dramatically over the past 40 years prior studies interpret this trend as a decline in earnings quality but disagree on whether it results from changes in the real economy or changes in accounting standards i find that each new cohort of listed firms exhibits lower earnings quality than its predecessors mainly because of higher intangible intensity i conclude that the trend of decline in earnings quality is due more to changes in the sample of firms than to changes in generally accepted accounting principles gaap or in the earnings quality of previously listed firms

performance versus design standards in the regulation of pollution abstract this paper presents a model of pollution regulation in an oligopolistic market two forms of regulation are considered performance standards which regulate pollution directly by an upper limit on emissions and design standards which regulate pollution indirectly by a minimum usage requirement of an enissions control input equilibria under each regulatory regime are characterized a welfare analysis reveals that performance standards are preferred to design standards if the objective is minimization of emissions plus pollution damage costs however the comparison is indeterminate if the regulator s objective is total surplus less pollution damage an equivalence between emissions taxes and performance standards is established so the above welfare comparisons also apply to emissions taxes versus design standards

farm level pathways to improved nutritional status global national and local policies and programs for agricultural development arerecurrently justified based on their alleged role in improving food and nutrition security however strikingly little evidence is available to prove that a direct household level linkbetween agricultural production and improved nutrition exists the objective of thisspecial issue is to systematically and empirically test using data from africa and southasia whether a relationship between household agricultural production and nutrition canbe found overall the studies in this special issue support the hypothesis that householdagricultural production has direct and important linkages with dietary patterns andnutrition

a complete solution to a class of principal agent problems with an application to the control of a self managed firm this paper considers a class of principal agent problems which have the following features 1 there is adverse selection because the principal ignores the value of one parameter of the agent s true characteristics 2 leaving aside the information parameter the principal s welfare as well as the agent s welfare depend on two types of variables observable to both of them the first ones possibly multidimensional are called action variable s and the second one which is one dimensional has in general the meaning of a money transfer 3 the principal is a stackelberg leader of the two person game he can commit himself to decision rules which are admissible on informational grounds he optimizes within the adequate class taking into account besides the agent s reaction one constraint which has generally the meaning of an individual rationality constraint and sometimes of a feasibility constraint the optimization is limited to the class of non stochastic mechanisms 4 the problem can also receive an alternative interpretation the principal faces a continuum of agents of unknown characteristics the distribution being known however stylized principal agent problems of this type have often been considered in the economic literature in particular the reader will later be able to recognize that the standard income tax model a la mirrlees 1971 the quality or quantity choice model of the monopolist a la mussa and rosen 1978 or maskin and riley 1982 and the model of government regulation of the private monopolist of baron and myerson 1982 all belong to

the dartboard column second hand information and price pressure this study analyzes the effect of second hand information on the behavior of security prices and volume using analysts recommendations published in the monthly dartboard column of the wall street journal for the two days following the publication of the recommendations average positive abnormal returns of 4 percent nearly twice the level of abnormal returns documented in previous research on analyst recommendations and average volume double normal volume levels on the two days following publication of the recommendations are documented the positive abnormal return on announcement is partially reversed within 25 trading days the authors conclude that the positive abnormal return on announcement of the recommendations is a result of naive buying pressure as well as the information content of the analysts recommendations

pollution control with imperfectly observable emissions in this paper a model of environmental regulation with imperfect monitoring of emissions is presented the regulator can use linear output taxes and emission taxes to influence the pollution level of a risk averse firm in contrast to the perfect monitoring case a tax mix will usually be optimal the relative weight depends on the degree of risk aversion and monitoring imperfection and on technological factors

regulating an externality generating public utility a multi dimensional screening approach abstract in this paper i present a monopoly screening model in which a firm holds private information on fixed abatement costs because of the nature of the optimal contracts bunching is never optimal even with n distinct types a characterization of full and limited information solutions is offered and it is shown that the design standards alone determine the value of an information rent the variable charge is completely free of any marginal information costs this allows the variable charge to track marginal damages and thereby ensures that marginal social costs are covered a fixed charge implements the optimal solution

does product complexity matter for firms output volatility abstract with this paper we provide the first micro level evidence on the linkage between firm complexity and volatility by defining product complexity a la hausmann and hidalgo 2009 we find that a higher complexity level of a firm s product basket is associated to a reduction of its output fluctuations this evidence is robust to the control for omitted variables sample selection and to the use of alternative volatility and complexity indicators across similar firms active in different sectors and regions both technological factors and product market conditions explain the effect of complexity on volatility however within narrowly defined sectors and locations the complexity volatility nexus fully reflects the role of the human capital content of firms product baskets

varying heterogeneity among u s firms facts and implications abstract u s firms stock return volatility rose fivefold from 1971 through 2000 and then reverted to near 1971 levels by 2006 this was driven mainly by a rise and fall in the firm specific rather than systematic component of volatility firm level total factor productivity growth volatility exhibited a similar pattern we hypothesize that firm heterogeneity reflected in firm specific volatility rises as a new general purpose technology gpt propagates across the economy and then ebbs once the gpt is widespread measuring gpt adoption by information technology capital intensity we find robust cross industry empirical evidence supporting the hypothesis

regulating an externality generating utility environmental taxes under limited information global warming is currently an important item on most nationalenvironmental agendas in many countries coal fired electricity generatingstations represent an important source of greenhouse gases we examinehow regulations to curb emissions affect public utility pricing regulationwhen regulators act non cooperatively we show that when there is limitedinformation on fixed abatement costs an environmental regulator prefersan emission tax over an output tax or a lump sum environmental tax thepublic utility regulator prefers the lump sum tax regime

the impacts of hybrid maize seed on the welfare of farming households in kenya this paper explores the impacts of hybrid maize adoption on the welfare of farming households in kenya we use a four year panel dataset to estimate the effects of hybrid seed use on four indicators of household welfare namely income assets inequality and poverty results show that use of hybrid seed not only contributes to higher annual income but also to raising the value of assets possibly reflecting longer term welfare effects further we find that use of hybrid seed reduces the depth of poverty and that the amount planted reduces inequality as expected impacts differ between major and minor maize growing areas of the country maize farmers who do not use hybrid seed are clearly disadvantaged this calls for continued public and private investments in the infrastructure and policy process that supports a competitive liberalized seed industry and improved access of smallholder farmers to well adapted affordable hybrids

regulating a monopolist with unknown costs we consider the problem of how to regulate a monopolistic firm whose costs are unknown to the regulator the regulator s objective is to maximize a linear social welfare function of the consumers surplus and the firm s profit in the optimal regulatory policy prices and subsidies are designed as functions of the firm s cost report so that expected social welfare is maximized subject to the constraints that the firm has nonnegative profit and has no incentive to misrepresent its costs we explicitly derive the optimal policy and analyze its properties in their classic papers dupuit 2 and hotelling 5 considered pricing policies for a bridge that had a fixed cost of construction and zero marginal cost they demonstrated that the pricing policy that maximizes consumer well being is to set price equal to marginal cost and to provide a subsidy to the supplier equal to the fixed cost so that a firm would be willing to provide the bridge this first best solution is based on a number of informational assumptions first the demand function is assumed to be known to both the regulator and to the firm while the assumption of complete information may be too strong the assumption that information about demand is as available to the regulator as it is to the firm does not seem unnatural a second informational assumption is that the regulator has complete information about the cost of the firm or at least has the same information about cost as does the firm this assumption is unlikely to be met in reality since the firm would be expected to have better information about costs than would the regulator as weitzman has stated an essential feature of the regulatory environment i am trying to describe is uncertainty about the exact specification of each firm s cost function in most cases even the managers and engineers most closely associated with production will be unable to precisely specify beforehand the cheapest way to generate various hypothetical output levels because they are yet removed from the production process the regulators are likely to be vaguer still about a firm s cost function 12 p 684 as this observation suggests it is natural to expect that a firm would have better information regarding its costs than would a regulator the purpose of this paper is to develop an optimal regulatory policy for the case in which the regulator does not know the costs of the firm one strategy that a regulator could use in the absence of full information about costs is to give the firm the title to the total social surplus and to delegate the pricing decision to the firm in pursuing its own interests which would then be to maximize the total social surplus the firm would adopt the same marginal cost pricing strategy that the regulator would have imposed if the regulator had

optimal environmental taxation and enforcement policy abstract we study the optimal environmental taxation and enforcement policy when i the regulator does not know the firms abatement costs ii penalties for tax evasion are limited and iii monitoring of pollution is costly we show that the threat of being audited alter the usual firms incentives to over estimate their abatement costs in particular depending on the firms abatement costs the optimal policy may involve over or under deterrence compared to the full information outcome we then investigate the properties of a pollution standard we show that this policy comes close to an environmental tax once the economic incentives of the accompanying enforcement policy are considered