distinguishing between equilibrium and integration in spatial price analysis this article introduces a new spatial price analysis methodology based on maximum likelihood estimation of a mixture distribution model incorporating price transfer cost and trade flow data this method permits differentiation between market integration and competitive market equilibrium and derivation of intuitive measures of intermarket tradability competitive market equilibrium perfect integration segmented equilibrium and segmented disequilibrium one can also use these estimates to derive semiparametric measures of time varying regime probabilities to track changing market conditions an application to trade in soybean meal among pacific rim economies demonstrates the usefulness of the method copyright 2002 oxford university press

natural resources curse or blessing are natural resources a curse or a blessing the empirical evidence suggests that either outcome is possible this paper surveys a variety of hypotheses and supporting evidence for why some countries benefit and others lose from the presence of natural resources these include that a resource bonanza induces appreciation of the real exchange rate deindustrialization and bad growth prospects and that these adverse effects are more severe in volatile countries with bad institutions and lack of rule of law corruption presidential democracies and underdeveloped financial systems another hypothesis is that a resource boom reinforces rent grabbing and civil conflict especially if institutions are bad induces corruption especially in nondemocratic countries and keeps in place bad policies finally resource rich developing economies seem unable to successfully convert their depleting exhaustible resources into other productive assets the survey also offers some welfare based fiscal rules for harnessing resource windfalls in developed and developing economies

income dynamics in tamil nadu india from 1971 to 2003 changing roles of land and human capital this article examines the changing role of physical and human capital in income dynamics in tamil nadu india using detailed daily records of farming households from 1971 to 2003 we find that income growth until the early 1990s is attributed to the rice green revolution and the associated development of nonrice farm sector further growth after the 1990s became possible due to the rapid nonfarm sector development that has been stimulated by the liberalization of indian economy since 1991 in accordance with this change in income structure the importance of physical and human capital has changed human capital was important in the early 1970s to take advantage of the rice green revolution technology once the new technology became standard among farmers human capital became an insignificant factor the importance of human capital has revived in a different manner in recent years firstly because it has increased farmers access to nonfarm job opportunities and secondly because farm management has become more knowledge intensive in the face of increasing scarcity of labor and water the contribution of physical capital increased during the green revolution period while it started declining after that the changing mechanism is characterized as the shifting importance from physical to human capital in accordance with the changing engines of income growth from the green revolution to the development of nonfarm sector

trading on inside information evidence from the share structure reform in china abstract we examine stock trading activities in days before chinese listed firms made public announcement to start share structure reform there is significant evidence that relative to a benchmark period institutional investors bought more event firms shares in the last two trading days prior to announcement randomization tests show significant differences in institutional trading activities between event firms and matched control firms which suggests that some institutions had inside information moreover large trades account for a significant proportion of daily stock price changes in the last 2 days the evidence is consistent with the prediction by holden and subrahmanyam 1992 that when multiple informed investors acquire the same piece of information they will trade aggressively we also find that over the reform period the median share value change of event firms is 6 higher than that of control firms our findings have important implications for enforcement of insider trading regulations in china

insider trading investment and liquidity a welfare analysis we compare equilibrium trading outcomes with and without participation by an informed insider assuming inflexible ex ante aggregate investment choices by agents noise trading arises from aggregate uncertainty regarding other agents intertemporal consumption preferences the welfare levels of outsiders can thus be ascertained the allocations without insider trading are not ex ante pareto efficient because our model differs from standard ones with negative exponential utility functions and normal returns we characterize the circumstances under which the revelation of payoff relevant information via prices arising from insider tradingbenefits outsiders with stochastic liquidity needs by improving risk sharing among them in models of informed trading allen 1984 dennert 1992 grossman and stiglitz 1980 kyle 1985 leland 1992 repullo 1994 it has been customary in order not to have an unrealistic fully revealing rational expectation equilibrium ree and no profits for informed traders to postulate some portion of the market demand for securities as arising from unmodeled noise traders whose endowments and preferences for consumption are left unspecified this makes it difficult to reach a welfare judgment regarding the impact of insider trading even when the implications for the informativeness of asset prices and investment can be ascertained thus an important issue in financial regulatory policy regarding the desirability of allowing trading by asymmetrically informed corporate insiders remains largely unresolved at the conceptual level our major goal in this paper is to rectify this shortcoming by modeling both noise traders and rational a priori uninformed traders together as agents with well specified preferences these agents allocate their endowments across a risky long term and a riskless short term investment ex ante london school of economics and political science and cepr and universita degli studi di torino respectively we are grateful for financial support from the ente einaudi the italian murst and the international centre for economic research icer torino it is a pleasure to acknowledge the excellent research assistance of giacomo elena work on this paper was begun while bhattacharya was a visiting fellow at icer during the summer of 1995 we wish to thank without implicating in errors gabriella chiesa and jose marin for advice and encouragement and participants at seminars at the universities of brescia roma tor vergata tilburg torino the cepr conference on information financial intermediation and the macroeconomy alghero 1997 as well as an anonymous referee and the editor rene stulz for their very helpful comments and suggestions

dual class recapitalizations as antitakeover mechanisms abstract we report evidence on shareholder wealth effects of 94 firms recapitalizing with dual classes of common stock with disparate voting rights we find significant negative abnormal stock price returns at the announcement of the dual class recapitalization when we consider recapitalizations separately announced since the nyse imposed a moratorium is june 1984 on the delisting of companies with dual classes of equity we find significant negative abnormal returns as compared with insignificant returns in the earlier period those firms recapitalizing from june 1986 through may 1987 experienced the most significant negative returns observed

the optimal enforcement of insider trading regulations regulating insider trading lessens the adverse selection problem facing market makers enabling them to quote better prices an optimal enforcement policy must balance these benefits against the costs of enforcement such a policy must specify i the conditions under which the regulator conducts an investigation ii the penalty schedule imposed if an insider is caught and iii a transaction tax to fund enforcement we derive the policy that maximizes investors welfare this policy entails investigations following large trading volumes or large price movements or both insiders caught making large trades are assessed the maximum penalty but small trades are not penalized given this policy insiders trade most aggressively on news with an intermediate price impact but refrain from trading on moderate or extreme news

a household hedonic model of rice traits economic values from farmers in west africa abstract new crop varieties often have been promoted in developing countries based upon superior yield vis a vis locally available varieties this research presents a hedonic price model for upland rice by drawing upon the input characteristics and consumer good characteristics model literature model specification tests determine that a combination of production and consumption characteristics best explains the willingness to pay for new upland rice varieties the household model specification determined that five traits explain the willingness to pay for new rice varieties plant cycle length plant height grain colour elongation swelling and tenderness yield was not a significant explanatory variable of the willingness to pay for seed the implications of this model are two fold first varietal development and promotion must include post harvest characteristics in addition to production traits when determining which varieties to promote for official release secondly non yield production characteristics such as plant height and cycle length are significant factors in producer s assessments of the value of a new variety overall this paper provides an alternative explanation for limited adoption of modern upland rice varieties in west africa varietal evaluation programs have focused too narrowly on yield evaluation and have not promoted varieties with superior non yield characteristics than locally available varieties

the curse of natural resources in fractionalized countries abstract this paper develops a model that can explain why natural resources are a blessing for some countries but a curse for others in this model natural resources cause fighting activities between rivalling groups fighting reduces productive activities and weakens property rights making productive activities even less attractive the aggregate production decrease exceeds the natural resources direct positive income effect if and only if the number of rivalling groups is sufficiently large the model thus predicts that natural resources lower incomes in fractionalized countries but increase incomes in homogenous countries empirical evidence supporting this prediction is provided

a note on geography institutions and income inequality abstract past studies have linked geography and history to institutions and income but how have they influenced income inequality i consider long run determinants of income inequality using a cross section of countries only being landlocked has a strong association with inequality

insider trading outside search and resource allocation why firms and society may disagree on insider trading restrictions we show that entrepreneurs may prefer to allow insider trading even when it is not socially optimal we examine a model in which an insider manager allocates resources on the basis of his private information and outside information conveyed through the secondary market price of the firm s shares if the manager is allowed to trade he will compete with informed outsiders reducing the equilibrium quality of outside information while the benefits to production of outside information are the same for society and entrepreneurs we show that the social and private costs are different thus entrepreneurs and society may disagree on the conditions under which insider trading restrictions should be imposed article published by oxford university press on behalf of the society for financial studies in its journal the review of financial studies

adoption of agricultural innovations in developing countries a survey this paper reviews various studies which have provided a description and possible explanation to patterns of innovation adoption in the agricultural sector the survey points out that the tendency of many studies to consider innovation adoption in dichotomous terms adoption nonadoption may not be appropriate in many cases where the actual decisions are defined over a more continuous range more attention needs to be given to the socio cultural and institutional environment in area studies so that their interrelation with economic factors affecting adoption can be inferred the presence of several interrelated innovations is another aspect that needs to be considered more carefully in future research since a number of simultaneous decisions may be involved furthermore the possibility of regular sequential patterns in adopting components of a new technological package should be specifically addressed in future studies finally the impact of differential adoption rates on land holding distribution merits attention in future research

natural resources and income inequality the role of ethnic divisions we hypothesize that natural resources raise income inequality in ethnically polarized societies but reduce income inequality in ethnically homogenous societies and we present empirical evidence in support of this hypothesis

natural resource booms and inequality theory and evidence we develop a theory in the context of a two sector growth model in which learning by doing drives growth to explain the time path of income inequality following natural resource booms in resource rich countries under the condition of a relatively unskilled labor intensive non traded sector inequality falls immediately after a boom and then increases steadily over time until the initial impact of the boom disappears using data for 90 countries between 1965 and 1999 we find evidence in support of the theory especially for oil and mineral booms we also find that uncertainty about future commodity prices increases long run inequality

resource shocks and human capital stocks brain drain or brain gain abstract based on the paradox of plenty resource abundant countries tend to be vulnerable for lower economic prosperity along with instable political institutions as well as corruption this paper sheds light on the relationship between resource abundance and the selectivity of migration first i combine a dutch disease model with a roy borjas model in order to elaborate on the relationship between resource shocks and migrant selectivity theoretically thereby i predict that resource booms give rise to brain drain effects which are mediated through distributional effects under certain conditions second i provide empirical evidence for the effect of resource shocks on migrant selectivity based on a structural equation model in order to disentangle effects on income inequality and migrant selectivity the results show that resource shocks especially oil booms strengthen brain drain effects in a sample with 116 source and 23 destination countries between 1910 and 2009

extending the concept of the resource curse natural resources and public spending on health this paper extends the concept of the resource curse by studying whether and through which transmission channels natural resource wealth affects social spending even though the availability of vast natural capital reserves has commonly been linked to the neglect of human development most of the literature has continued to focus on economic performance this paper is the first to empirically investigate the link between natural resource wealth and public health expenditures in light of the hypothesis that resource wealth as a source of unearned state income enhances state autonomy and increases volatility which leads to policies that fail to prioritize human development using a large panel dataset of world countries covering the period from 1995 to 2009 we find a robust significant inverse relationship between natural resource dependence and even abundance and public health spending over time the effect remains significant after controlling for state autonomy volatility and other factors these findings have implications for national authorities as well as the extractive industry governments should be made accountable for natural resource wealth and correct taxation could provide additional resources earmarked for health the extractive industry could increase their investments in sustainable corporate social responsibility operations specifically in the health sector

quantifying spillover effects from large land based investment the case of mozambique summary almost a decade after a spike in land demand following the 2007 08 commodity boom evidence on impacts of this phenomenon remains limited and mostly case study based we show that information on location and start data of large farms combined with existing smallholder farm surveys allows to complement this with a difference in difference approach to systematically assess spillovers from large farm establishment illustrative application to mozambique suggests positive short term effects from newly established large farms on adoption of agricultural practices and input use by small farms less than 50 km from newly established large operations robustness checks for crop farms only also suggest job creation in the proximity of newly established crop but not livestock farms yet large farm establishment decreased perceived well being within a 25 km band and in the time horizon considered here did not lead to better access to output markets cultivation of larger areas or once other factors are controlled for higher yields this allows us to reject the notion of negative spillovers from large farm establishment but casts doubt on the wisdom of large unconditional subsidies to attract investors in addition to drawing policy conclusions for mozambique we highlight the methodology s wider applicability and scope for expansion

optimal investment in transportation infrastructure when middlemen have market power a developing country analysis transportation costs and buyer market power reduce prices and income received by farmers in developing countries transportation costs directly affect the marketing margin and also exacerbate market power by limiting farmers access to buyers this article develops a multistage spatial model to determine optimal investment in transportation improvements taking account of impacts on marketing costs and competition the beneficial impact of investments from farmers perspective is mainly through enhanced competition meaning significant under investment may occur if this effect is ignored however the optimal investment depends on the relative importance of transportation costs in some settings transportation improvements reduce farm prices because buyers rationally over compensate farmers for these costs

insider trading legislation and corporate governance this paper analyzes the impact of insider trading legislation on corporate governance in a context where large dominant shareholders can monitor underperforming companies managers have an incentive to give early warnings about adverse developments to dominant shareholders this information is effectively a bribe to induce dominant shareholders to sell their stock and refrain from intervention if insider trading is unregulated dominant shareholders collude with management at the expense of small shareholders the optimal regime forces the company to disclose all material information to the market private contracting between companies and shareholders leads to optimal insider trading regulation only if initial shareholders can enter a binding commitment otherwise large shareholders and managers recontract at the expense of small share holders enforcement also matters european union legislation requires inside information to be precise such a narrow definition creates a grey zone where information is private but cannot be classified as inside information as a result the effectiveness of corporate governance and firm value are reduced regulation in the us that treats shareholders with a stake exceeding 10 as insiders is potentially harmful

investment and insider trading within a dynamic environment this paper introduces an inside trader to an economy where rational but uninformed traders choose between investment projects with different levels of insider trading when inside information has little value in future investment decisions insider trading distorts investment towards assets with less private information imposing net welfare costs on the economy when an insider s private information is valuable in making future investment decisions the net social benefit of inside trading can be positive the resulting increases in investment efficiency due to more informative prices is enough to compensate for the distortion induced by the inside trader when insiders receive private information more than once insiders may trade to reveal their private information at the beginning of their relationship with the firm this has two effects i more information is revealed in equilibrium and ii there is less chance than an uninformed agent will have to trade with the insider both these effects reduce the investment inefficiencies associated with insider trading as a consequence uninformed liquidity traders prefer to trade in a market with a long term insider this improvement in investment efficiency leads to a pareto improvement both the uninformed traders and the insider are made better off if the insider receives information more than once

resource rents distribution income inequality and poverty in iran abstract our goal is to examine the income inequality and welfare effects of the direct distribution of resource rents and subsequent taxation in iran we use survey based microdata that covers 140 000 individuals which include more than 36 000 iranian urban and rural households in 2009 we examine how direct distribution of oil and gas rents among all citizens and a subsequent direct income tax differ from distributional impacts of targeted policies on income inequality and poverty in iran our analysis shows that the resource dividend policy with a subsequent direct income tax has a significant decreasing effect on the household gini index while targeted policies are more effective in reducing number of households under the poverty line

learning by doing and learning from others human capital and technical change in agriculture household level panel data from a nationally representative sample of rural indian households describing the adoption and profitability of high yielding seed varieties hyvs associated with the green revolution are used to test the implications of a model incorporating learning by doing and learning spillovers the estimates indicate that i imperfect knowledge about the management of the new seeds was a significant barrier to adoption ii this barrier diminished as farmer experience with the new technologies increased iii own experience and neighbors experience with hyvs significantly increased hyv profitability and iv farmers do not fully incorporate the village returns to learning in making adoption decisions

agricultural technology crop income and poverty alleviation in uganda summary this paper evaluates the ex post impact of adopting improved groundnut varieties on crop income and poverty in rural uganda the study utilizes cross sectional data of 927 households collected in 2006 from seven districts in uganda using propensity score matching methods we find that adopting improved groundnut varieties technology significantly increases crop income and reduces poverty the positive and significant impact on crop income is consistent with the perceived role of new agricultural technologies in reducing rural poverty through increased farm household income this study supports broader investment in agriculture research to address vital development challenges reaching the poor with better technologies however requires policy support for improving extension efforts access to seeds and market outlets that simulate adoption

voting power in the proxy process abstract the likelihood that a firm will enact a management sponsored antitakeover charter amendment depends on ownership structure this implies that the adoption of antitakeover amendments may be anticipated then announcement returns provide a biased estimate of wealth effects an estimator that corrects for the bias induced by anticipation indicates that the enactment of an antitakeover amendment is associated with a statistically significant decrease in shareholder wealth the voting power of employee stock ownership plans and the chief executive officer plays a prominent role in determining whether a firm will adopt this type of takeover defense

potential of and constraints to the rice green revolution in mozambique a case study of the chokwe irrigation scheme abstract this paper investigates the potential of and constraints to a lowland rice green revolution in mozambique using data from an agro climatically favorable area the chokwe irrigation scheme our data show that although the potential is high the insufficient supply of irrigation water excessively expensive chemical fertilizer and moderately costly labor hinder the scheme from achieving that potential first of all an improvement in irrigation is crucial as it increases yield not only directly but also indirectly through its complementary relationship to chemical fertilizer we also find that an improvement in credit access is important as it can increase the application of chemical fertilizer and labor by making the acquisition of these expensive inputs through markets possible the unavailability of hired and exchange labor during peak seasons is another constraint to the intensive use of labor the introduction of rice varieties with a shorter maturity duration would relax the timing of transplanting and thus spread out the peak seasons labor demand

rising trends and variability of rice prices threats and opportunities for sub saharan africa abstract nearly 40 of the rice consumed in africa is imported that is about one third of all rice traded in world markets with such high dependence on imports africa is highly exposed to international market shocks with sometimes grave consequences for its food security and political stability as attested by events during the 2008 food crisis in this paper it is argued that africa can turn the rising trends in world markets to a historical opportunity to realize its large potential for rice production after a review of the policy responses of african countries to the 2008 global rice crisis the opportunities and challenges for enhancing domestic rice supply are discussed the competitiveness of rice production in africa is analyzed for selected countries and rice ecologies the potential for increasing paddy production is illustrated using a spreadsheet simulation that considers alternative rice sector development scenarios reducing the yield gap and expanding cultivated rice areas under lowland and irrigated hold the greatest potential for substantially increasing paddy production in africa

is india s economic growth leaving the poor behind there has been much debate about how much india s poor have shared in the economic growth unleashed by economic reforms in the 1990s the authors argue that india has probably maintained its 1980s rate of poverty reduction in the 1990s however there is considerable diversity in performance across states this holds some important clues for understanding why economic growth has not done more for india s poor india s economic growth in the 1990s has not been occurring in the states where it would have the most impact on poverty nationally if not for the sectoral and geographic imbalance of growth the national rate of growth would have generated a rate of poverty reduction that was double india s historical trend rate states with relatively low levels of initial rural development and human capital development were not well suited to reduce poverty in response to economic growth the study s results are consistent with the view that achieving higher aggregate economic growth is only one element of an effective strategy for poverty reduction in india the sectoral and geographic composition of growth is also important as is the need to redress existing inequalities in human resource development and between rural and urban areas

weather shocks and spatial market efficiency evidence from mozambique the aim of this paper is to study the association between weather shocks droughts and floods and agricultural market performance in mozambique to do so we employ a dyadic regression analysis on

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

income distribution factor endowments and trade openness abstract this paper studies the empirical links among factor endowments trade and personal income distribution by using panel data we show that land and capital intensive countries have a less equal income distribution while skill intensive countries have a more equal income distribution we also show that the effects of trade openness on inequality depend on factor endowments in a way consistent with several recent case studies but not with the simple hecksher ohlin framework our results are robust to the division of the sample according to level of income the inclusion of different regressors the use of different measures of trade openness and of relative factor abundance and tests for possible problems of endogeneity

oil curse economic growth and trade openness an important economic paradox in the economic literature is that countries with abundant natural resources are poor in terms of real gross domestic product per capita this paradox known as the resource curse is contrary to the conventional intuition that natural resources help to improve economic growth and prosperity using panel data for 95 countries this study revisits the resource curse paradox in terms of oil resources abundance for the period 1980 2017 in addition the study examines the role of trade openness in influencing the relationship between oil abundance and economic growth the study finds trade openness is a possible avenue to reduce the resource curse in our sample trade openness reduces oil curse by around 25 trade openness allows countries to obtain competitive prices for their resources in the international market and access advanced technologies to extract resources more efficiently therefore natural resource rich economies can reduce the resource curse by increasing exposure to international trade

reasonable doubt and the optimal magnitude of fines should the penalty fit the crime models of the enforcement compliance relationship have assumed that both the probability and magnitude of fines are independent choice variables of policy makers these models indicate that it may be optimal to monitor with lowfrequency but to inflict uniformly maximal penalties for all infractions detected this article shows that if the judicial system is built on the reasonable doubt test then the penalty and the probability of conviction are not independent in particular as the penalty increases the probability of conviction falls as a result uniformly maximal penalties may actually encourage crime rather than deter it this article shows that optimal fines should rise with the severity of the infraction that is the penalty should fit the crime models of the enforcement compliance relationship generally treat both the probability and magnitude of fines as independent choice variables of the government this approach has led becker 1968 and others to conclude that it is optimal to set uniformly maximal penalties for all crimes and to set the probability of conviction at the minimum level necessary to enforce compliance with the law while this normative prescription is natural and intuitive there still remains a larger positive question of why in most nations of the world penalties are not uniformly high but rather rise with the severity of the crime one possible resolution of the positive and normative questions may lie in the fact that penalties and probabilities of conviction are not generally independent convictions are typically determined by judges or jurors who are instructed to convict only if the evidence convinces them beyond a reasonable doubt that the accused is guilty psychologists however have found that a juror s willingness to convict may be influenced by more than just the evidence jurors are very sensitive to the potential penalties that defendants may pay

does aggregation hide the harmful effects of inequality on growth abstract aggregation can severely bias conventional tests of whether inequality impedes growth a micro growth model estimated on farm household data for rural china indicates that asset inequality in the area of residence has a harmful external effect on consumption growth the effect is lost in a regional growth regression

why has economic growth been more pro poor in some states of india than others abstract we use 20 household surveys for india s 15 major states spanning 1960 1994 to study how the sectoral composition of economic growth and initial conditions interact to influence how much growth reduced consumption poverty the elasticities of measured poverty to farm yields and development spending did not differ significantly across states but the elasticities of poverty to urban and rural non farm output varied appreciably and the differences were quantitatively important to the overall rate of poverty reduction states with higher elasticities did not experience higher rates of non farm growth the non farm growth process was more pro poor in states with initially higher literacy higher farm productivity higher rural living standards relative to urban areas lower landlessness and lower infant mortality

measuring the impact of road rehabilitation on spatial market efficiency in maize markets in mozambique this article analyzes the impact of road rehabilitation on the spatial market efficiency of maize markets in mozambique we estimate a modified version of the parity bounds model pbm that allows us to test the impact of road rehabilitation on spatial efficiency this article seeks to contribute to the existing literature in three ways first a unique data set where road rehabilitation episodes between market pairs are identified is developed second special care is devoted to estimation of transaction costs due to the sensitivity of the pbm model to the quality of transaction costs estimates finally as opposed to most existing literature that focuses on relatively distant markets the article focuses on spatially closed markets we find that maize markets tend to be segmented due to high transport costs following road rehabilitation inefficiency and average absolute price differentials tend to decrease and market pairs have tended to shift toward autarky regimes overall while the results point broadly toward a positive impact of road rehabilitation on spatial efficiency they are not as strong or as robust as one would like large increases in fuel prices likely offset the positive impacts of road rehabilitation on transaction costs contributing to the increase in the probability of being in an autarky regime

introduction to the special issue on the role of nonfarm income in poverty reduction evidence from asia and east africa in this special issue we present seven studies that collectively attempt to investigate the role of non farm income in long term and short term poverty reduction in asia and africa the first four studies out of the seven use long term panel data over two decades in the philippines thailand bangladesh and india these studies show drastic increases in non farm income shares and corresponding declines in poverty levels over time especially in the philippines and thailand education levels of household members and returns to education also increased significantly in these countries the remaining three studies use cross sectional and short term panel data from ethiopia kenya and uganda these african studies show high proportions of poor households and low shares of non farm income that are somewhat comparable to the situation in the 1980s described in the asian studies without the green revolution that provided stable farm income and potential financial resources to invest in children education in asia it is not clear if african farm households can follow the asian examples

poverty reduction effects of agricultural technology adoption a micro evidence from rural tanzania abstract this article evaluates the impact of adoption of improved pigeonpea technologies on consumption expenditure and poverty status using cross sectional data of 613 households from rural tanzania using multiple econometric techniques we found that adopting improved pigeonpea significantly increases consumption expenditure and reduces poverty this confirms the potential role of technology adoption in improving household welfare as higher incomes translate into lower poverty this study supports broader investment in agriculture research to address vital development challenges reaching the poor with better technologies however requires policy support for improving extension efforts access to seeds and market outlets that stimulate adoption

does natural resource abundance increase latin american income inequality abstract why is income inequality higher in latin america than in east asia is this phenomenon related to the region s natural resource abundance is it a contributor to latin america s slow and narrowly focused human capital accumulation if so can anything be done to reverse the latin american trends or should we think of the region s fate as unalterable to help answer these questions this paper draws upon standard trade theory and cross sectional empirical analysis to demonstrate that natural resource intensive sectors particularly permanent agriculture absorb capital that might otherwise flow to manufacturing this depresses workers incentive to accumulate skill and delays industrialization

insider trading in a rational expectations economy it is often argued that efficiency considerations require society to freely permit insider trading in this article an opposing efficiency argument is formalized the model incorporates an investment stage followed by a trading stage if outsiders expect insiders to take advantage of them in trading outsiders will reduce their investment the insiders loss from this diminished investor confidence may more than offset their trading gains consequently a prohibition on insider trading may effect a pareto improvement insiders are made better off if they can precommit not to trade on their privileged information govemment regulation accomplishes exactly this jel 022 026 313 the traditional rationale articulated for insider trading regulation and other securities law is that such rules promote confidence in markets indeed president franklin d roosevelt justified the first major u s securities legislation by saying it should give impetus to honest dealing in securities and thereby bring back public confidence similar language is still invoked half a century later in connection with enforcement efforts against insider trading and in proposals for tightened stock

exploring poverty traps and social exclusion in south africa using qualitative and quantitative data abstract recent theoretical work hypothesises that a polarised society like south africa will suffer a legacy of ineffective social capital and blocked pathways of upward mobility that leaves large numbers of people trapped in poverty to explore these ideas this paper employs a mix of quantitative and qualitative methods novel econometric analysis of asset dynamics over the 1993 98 period identifies a dynamic asset poverty threshold that signals that large numbers of south africans are indeed trapped without a pathway out of poverty qualitative analysis of this period and the period 1998 2001 more deeply examines patterns of mobility and confirms the continuation of this pattern of limited upward mobility and a low level poverty trap in addition the qualitative data permit a closer look at the specific role played by social relationships while finding ample evidence of active social capital and networks these are more helpful for non poor households for the poor social capital at best helps sta

why have some indian states done better than others at reducing rural poverty the unevenness of the rise in rural living standards in the various states of india since the 1950s allowed the authors to study the causes of poverty they modeled the evolution of average consumption and various poverty measures using pooled state level data for 1957 91 they found that poverty was reduced by higher agricultural yields above trend growth in nonfarm output and lower inflation rates but these factors only partly explain relative success and failure in reducing poverty initial conditions also mattered states that started the period with better infrastructure and human resources with more intense irrigation greater literacy and lower infant mortality rates had significantly greater long term rates of consumption growth and poverty reduction by and large the same variables that promoted growth in average consumption also helped reduce poverty the effects on poverty measures were partly redistributive in nature after controlling for inflation the authors found that some of the factors that helped reduce absolute poverty also improved distribution and none of the factors that reduced absolute poverty had adverse impacts on distribution in other words there was no sign of tradeoffs between growth and pro poor distribution

disclosure decisions by firms and the competition for price efficiency this paper develops a model of the relationship between investment decisions by firms and the efficiency of the market prices of their securities it is shown that more efficient security prices can lead to more efficient investment decisions this provides firms with the incentive to increase price efficiency by voluntarily disclosing information about the firm disclosure decisions are studied it is shown that firms may expend more resources on disclosure than is socially optimal this is in contrast to the concern implicit in mandatory disclosure rules that firms will expend too few resources on disclosure this paper develops a model of the relationship between firms investment decisions and the efficiency of the market prices of their securities it is shown that more efficient security prices can lead to more efficient investment decisions this provides firms with the incentive to increase price efficiency by voluntarily disclosing information about the firm disclosure decisions are studied the costs of disclosure are twofold first there are costs of producing and disseminating the information included here are opportunity costs of firms employees auditing and legal expenses costs of printing and distribution and costs associated with the release of any proprietary information second there are traders costs of assimilating the information for instance while it is not very costly to obtain a firm s 8 k and 10 k once produced it is quite costly to understand the implications of their contents while the former costs have been recognized in the literature on disclosure the latter costs have not that is while traders are sometimes viewed as having access to some costly information the information contained in firms disclosures is typically taken to be costlessly observed by all see for instance diamond 1985 and dye 1987 1 taking traders costs of learning the information content of firms disclosures into account leads to new conclusions regarding incentives to expend resources on disclosure in particular it is shown that firms may spend more on disclosure than is socially optimal this overdisclosure results from firms competing for the attention of traders this is an interesting result given the public policy concern that firms on their own will spend less on disclosure than is socially optimal

persistent poverty in north east ghana abstract this paper explores local poverty and wealth inequality in the upper east region of northern ghana in the period from 1975 89 land was not scarce and the social management of household membership and household labour were critical to household security but this social management was not independent of wealth status there was a virtuous circle between wealth and household labour supply and a vicious circle between poverty and small household size poverty traps existed so that those with too little labour and too little wealth engaged in strategies which entrenched them in poverty

market emergence and transition arbitrage transaction costs and autarky in china s grain markets using trimonthly chinese provincial grain prices from 1988 to 1995 we estimate a parity bounds model of interregional trade for four subperiods to characterize how multiple aspects of market performance change during the process of economic transition for each period we estimate the extent to which arbitrage opportunities are realized by traders the transaction costs between location pairs and the likelihood that regions do not trade trade restrictions cannot explain the pattern of uneven market development over time infrastructure bottlenecks managerial incentive reforms and production specialization policies all were likely important factors affecting market performance

nonfarm employment agricultural shocks and poverty dynamics evidence from rural uganda this article examines the role of off farm employment in poverty reduction over a short period of time by using panel data from 894 rural ugandan households in 2003 and 2005 taking advantage of the unique off farm labor supply and income data we analyzed how households respond to negative agricultural shocks especially through off farm labor supply and income to mitigate crop income loss our analysis indicates that the flexibility of labor time allocation varies across off farm jobs and that only low skilled and low wage jobs tend to be used to mitigate negative shocks especially among the asset poor

testing for spatial market integration evidence for colombia using a pairwise approach we examine the extent of spatial market integration in colombia using consumer price index data for 153 consumer goods in 13 cities an econometric analysis of the time series properties of all the possible city price differentials reveals that market integration tends to occur more frequently in unprocessed food products as opposed to processed foods other traded and nontraded products the results also support the view that except for nontraded products the speed at which prices adjust to the long run equilibrium is slower for cities that are farther apart

transfer costs spatial arbitrage and testing for food market integration conventional tests for food market integration ask often misleadingly whether prices in different locations move together in this paper an alternative methodology the parity bounds model pbm is developed which uses information on transfer costs in addition to food prices to assess the efficiency of spatial arbitrage monte carlo experiments using data generated by a point space spatial price equilibrium model show the pbm to be statistically reliable an application to philippine rice markets demonstrates that the pbm detects efficient arbitrage when other tests do not

market integration efficiency of arbitrage and imperfect competition methodology and application to u s celery this paper develops and applies a methodology to test for efficiency of interregional commodity arbitrage application of the methodology requires only time series data on prices for alternative cities regions countries or product forms yet the approach is capable of generating evidence on a number of market parameters including market integration arbitrage efficiency the magnitude of marketing margins product substitutability and competitiveness of markets estimation is based on a switching regression model with three regimes efficient arbitrage relative shortage and relative glut results from application of the model to u s celery marketing indicated significant departures from efficient arbitrage for both california and florida celery

inside trading and incentives the traditional arguments against inside trading insiders take advantage of other investors inside trading profits overcompensate managers see ross 1979 too much information is collected if inside trading is allowed see fama and laffer 1971 hirshleifer 1971 emphasize the social costs of prohibiting such trading without explaining the private incentives shareholders have to sanction this trading the efficiency argument in favor of inside trading inside trading improves the functioning of the stock market because information as a public good will be underproduced unless those who acquire it profit through inside trading demsetz 1969 does not explain shareholders support of inside trading because the owners of a firm do not seek to improve the efficiency of the stock market by sacrificing trading profits to insiders several alternative hypotheses for shareholders failure to impose restrictions on inside trading have been advanced this paper analyzes shareholders incentives to sanction inside trading i show that if a manager of a firm is initially compensated with earnings contingent contracts then the welfare of that manager and all of the firm s shareholders can be improved by allowing the manager to trade on his private information this result is established in the context of a multiple principal the shareholders single agent the manager model with the manager s trades observable ex post and is robust with respect to the specification of investors preferences and the definition of stock market equilibrium the topic of this paper originated in conversations with steve allen his comments as well as those of nicholas dopuch daniel fischel sanford grossman merton miller robert verrecchia and other members of the workshops on the applications of economics and on accounting research both at the university of chicago are gratefully acknowledged 1 for a list of such arguments see references in manne 1966 chap 1

inequality and institutions abstract this paper presents theory and evidence on the relationship between inequality and institutional quality we exhibit a model in which the two may dynamically reinforce each other and set to test this relationship with a broad array of institutional measures the double causality between institutional strength and a more equal distribution of income is empirically established using dynamic panel and linear feedback analysis

oil abundance and income inequality the paper empirically investigates the impact of natural resource abundance in particular oil on income disparities it employs common correlated effects pooled mean group methodology for estimation to account for the cross country heterogeneity and cross section dependence in the oil inequality nexus in a sample of developed and developing countries we find that oil abundance as well as oil dependence reduce income inequality this inequality reducing effect is highly likely to operate from better education attainments and improved health status due to oil booms

noise trading and takeovers a model of takeovers is investigated in which noise trading provides camouflage that makes it possible for a large corporate outsider to purchase enough shares at favorable prices so that takeovers become profitable although the model accommodates the possibility of dilution grossman and hart 1980 and a large incumbent shareholder shleifer and vishny 1986 neither dilution nor a large incumbent shareholder is necessary for costly takeovers to be profitable noise trading tends to encourage costly takeovers that otherwise would not occur and to discourage beneficial takeovers that otherwise would occur

natural resources a curse on education spending abstract in line with the rising interest in harnessing natural resource revenues for economic and human development through productive government investments this paper aims to address an important blind spot in our understanding of the resource curse by contributing innovative insights on how natural resource wealth impacts government priorities and expenditure practices using a large panel dataset of 140 countries covering the period from 1995 to 2009 we find an adverse effect of resource dependence on public education expenditures relative to gdp that is robust to controlling for a range of additional covariates furthermore our findings indicate that this resource curse effect on the government prioritization of education mainly stems from point source natural resources these results are of particular importance for the sustainable management of natural resource wealth in developing countries as they could achieve especially high returns by investing resource revenues in public goods such as education while this paper underlines the importance of institutions and government accountability our findings also raise questions on the role of the private sector as a partner in development as the extractives industry could consider increasing funding for education through corporate social responsibility csr initiatives

spatial price efficiency in mozambique s post reform maize markets maize zea mays shortages and maize price instability continue to occur in mozambique in spite of policy reforms and great capacity for increased production in northern mozambique this study measured the efficiency of spatial maize price arbitrage in mozambique s post reform period spatial price inefficiency does not seem to explain why food shortages continue to occur in mozambique suggesting nonprice market constraints such as poor infrastructure and poor market institutions as more likely explanations baulch s spatial efficiency test indicated that it is not profitable to ship maize from northern surplus maize regions to southern mozambique records of interregional maize shipments show that indeed grain is not being shipped from the north to the south market liberalization may have improved spatial price efficiency but high transfer costs still limit trade and potential benefits from freeing markets under these circumstances food shortages and price instability are likely to continue

assessing the impact of nerica on income and poverty in central and western uganda persistent food shortage and poverty in sub saharan africa ssa are major development issues new rice for africa nerica was developed to boost crop yield and income of rural households in ssa although its high yielding traits have become fairly well known there is no empirical analysis of its impact on income and poverty by taking the case of uganda where a nerica promoting program was initiated as one of the major poverty eradication measures this study attempts to compare actual income with the hypothetical income without nerica we found that introduction of nerica decreases poverty to a significant extent without deteriorating income distribution