telecommunications in greece a study of production structure and natural monopoly issue until recently telecoms were everywhere large monopolies basically because their production was believed to have many natural monopoly attributes now new forces originated in technological evolution have set in to transform the monopoly regime but did natural monopoly attributes really exist the empirical evidence under consideration concerns hellenic telecom a complete study of the industry s production structure and a natural monopoly test are offered test s results are important for policy formation regarding market s degree of liberalization in greece given also the resemblance of current technology in different countries it is possible to claim a more general validity of the obtained results on production technology beyond the specific case studied

commodity price shocks and civil conflict evidence from colombia how do income shocks aect armed con ict theory suggests two op posite eects if labor is used to appropriate resources violently higher wages may lower con ict by reducing labor supplied to appropriation this is the opportunity cost eect alternatively a rise in contestable income may increase violence by raising gains from appropriation this is the rapacity eect our paper exploits exogenous price shocks in inter national commodity markets and a rich dataset on civil war in colombia to assess how dierent income shocks aect con ict we examine changes in the price of agricultural goods which are labor intensive and natural resources which are capital intensive we focus on coee and oil the two largest exports we nd that a sharp fall in coee prices in the 1990s increased violence dierentially in regions growing more coee by lower ing wages and the opportunity cost of joining armed groups in contrast a rise in oil prices increased violence dierentially in the oil region by in creasing municipal revenue siphoned through rapacity this pattern holds in several other agricultural and natural resource sectors providing robust evidence that price shocks aect con ict in opposite directions depending on the factor intensity of the commodity

overreaction and underreaction in analysts forecasts abstract we examine hypotheses derived from behavioral decision theory regarding conditions that lead to overreaction and conditions that lead to underreaction in analysts earnings forecasts we argue that three heuristics jointly influence earnings forecasts leniency representativeness and anchoring and adjustment we present a model for the concurrent influence of these heuristics on forecast errors and examine three predictions of this model 1 that there is a tendency towards overreaction in forecast changes and underreaction in forecast revisions 2 that there is overreaction to positive forecast modifications and underreaction to negative forecast modifications and 3 that these biases increase with the forecast horizon

learning about a new technology pineapple in ghana this paper investigates the role of social learning in the diffusion of a new agri cultural technology in ghana we use unique data on farmers communication patterns to define each individual s information neighborhood conditional on many potentially confounding variables we find evidence that farmers adjust their inputs to align with those of their information neighbors who were surpris ingly successful in previous periods the relationship of these input adjustments to experience further indicates the presence of social learning in addition applying the same method to input choices for another crop of known technol ogy correctly indicates an absence of social learning effects jel d83 013 033 q16

macroeconomic forecasts and microeconomic forecasters in the presence of principal agent problems published macroeconomic forecasts by professional economists may not measure expectations forecasters may use their forecasts in order to manipulate beliefs about their ability i test a cross sectional implication of models of reputation and information revelation i find that as forecasters become older and more established they produce more radical forecasts since these more radical forecasts are in general less accurate ex post forecast accuracy grows significantly worse as forecasters become older and more established these findings are consistent with reputational factors at work in professional macroeconomic forecasts

strategic behavior of federal open market committee board members evidence from members forecasts abstract in this paper we use panel data to test whether federal open market committee fomc board members forecasts are rational rationality is rejected in the sense that forecasts by members are heavily dependent on previous own forecasts and last consensus made in fomc furthermore we reveal the strategic behavior of fomc board members forecasts by governors who always have voting rights agree much with the previous consensus of fomc members forecasts in contrast non governors who rotate voting rights exaggerate their forecasts they aggressively deviate their forecasts from previous consensus the former is herding behavior and the latter is anti herding behavior our results imply that individual members behave strategically governors want to present policy consistent forecasts to the congress and non governors utilize their forecasts to influence decision making in fomc

cartel quotas under majority rule the authors examine the choice of quotas by legal volume restricting organizations cartels commodity agreements agricultural marketing boards and prorationing boards unlike their illegal counterparts legal cartels have published regulations and broader enforcement capabilities however differences in costs and size among cartel members still make quota selection contentious conflicts over quotas are typically resolved by voting side payments to influence votes are prohibited the authors examine the predicted effects of this real world voting institution on prices and welfare they also deduce the economic consequences of exogenous political changes such as alterations in the voting weights or in the identity of the voters copyright 1995 by american economic association

analyst forecasts and herding behavior the use of analyst forecasts as proxies for investors earnings expectations is commonplace in empirical research an implicit assumption behind their use is that they reflect analysts private information in an unbiased manner as demonstrated here this assumption is not necessarily valid there is shown to be a tendency for analysts to release forecasts closer to prior earnings expectations than is appropriate given their information further analysts exhibit herding behavior whereby they release forecasts similar to those previously announced by other analysts even when this is not justified by their information these results are shown to have interesting empirical implications article published by oxford university press on behalf of the society for financial studies in its journal the review of financial studies

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

fundamental analysis future earnings and stock prices in this paper we investigate how detailed financial statement data fundamental signals enter the decisions of market participants by examining whether current changes in the signals are informative about subsequent earnings changes our approach is consistent with the view expressed by penman 1992 and others that predicting accounting earnings as opposed to explaining security returns should be the central task of fundamental analysis studying the links between fundamental signals and future earnings changes allows us to test directly the validity of the economic intuition that underlies the original construction of the signals an alternative and less direct approach followed by lev and thiagarajan 1993 henceforth lt is based on an examination of the relations between the fundamental signals and contemporaneous returns

the characteristics of individual analysts forecasts in europe abstract this study investigates the determinants of financial analysts forecasts differential accuracy in 14 different european stock markets using the i b e s detail history database i find that european financial analysts forecast accuracy is positively associated with analyst firm specific experience forecast accuracy is negatively associated with the number of countries followed by analysts and the age of the forecast surprisingly i find no relationship between forecast accuracy and analysts job experience and the size of the bank employing the analyst

capture and governance at local and national levels 135 despite the importance of this issue not much systematic research appears to have been devoted to assessing the relative susceptibility of national and local governments to interestgroup capture here we describe a model of two party electoral competition with probabilistic voting behavior and lobbying by specialinterest groups based on david baron 1994 and gene grossman and elhanan helpman 1996 that helps identify determinants of relative capture at different levels of government these include relative levels of voter awareness and interest group cohesiveness electoral uncertainty electoral competition heterogeneity of districts with respect to inequality and the electoral system while some of these uphold the traditional madisonian presumption others are likely to create a tendency for lower capture at the local level so the net effect is theoretically ambiguous this suggests that the extent of relative capture may be context specific and needs to be assessed empirically

following the leader a study of individual analysts earnings forecasts abstract this paper develops and tests procedures for ranking the performance of security analysts based on the timeliness of their earnings forecasts the abnormal trading volume associated with these forecasts and forecast accuracy our framework provides an objective assessment of analyst quality that differs from the standard approach which uses survey evidence to rate analysts we find that lead analysts identified by our measure of forecast timeliness have a greater impact on stock prices than follower analysts further we find that performance rankings based on forecast timeliness are more informative than rankings based on abnormal trading volume and forecast accuracy we also present evidence that analyst s forecast revisions are correlated with recent stock price performance suggesting that security analysts use publicly available information to revise their earnings forecasts

risk sharing networks and insurance against illness most risk sharing tests on developing country data are conducted at the level of the village generally the full risk sharing hypothesis is rejected this paper uses detailed data on all insurance networks within a village in tanzania networks are not clustered but largely overlapping we test whether full risk sharing occurs within these networks while village level full insurance cannot be rejected for food consumption we find evidence consistent with at least partial insurance of non food consumption via networks

momentum investment strategies portfolio performance and herding a study of mutual fund behavior this study analyzes the extent to which mutual funds purchase stocks based on their past returns as well as their tendency to exhibit herding behavior i e buying and selling the same stocks at the same time the authors find that 77 percent of the mutual funds were momentum investors buying stocks that were past winners however most did not systematically sell past losers on average funds that invested on momentum realized significantly better performance than other funds the authors also find relatively weak evidence that funds tended to buy and sell the same stocks at the same time copyright 1995 by american economic association

strong time consistency in the cartel versus fringe model due to developments on the oil market in the 1970s the theory of exhaustible resources was extended with the cartel versus fringe model to characterize markets with one big coherent cartel and a large number of small suppliers called the fringe because cartel and fringe are leader and follower the von stackelberg solution concept is appropriate for the supply side of this market the solution for the cartel versus fringe model presented in the previous literature proved to be time inconsistent for a large plausible range of values for extraction costs and initial reserves this paper provides a strongly time consistent solution for the cartel versus fringe model

relationships and growth on the dynamic interplay between relational contracts and competitive markets in economic development this paper presents a dynamic general equilibrium model to investigate how different contracting modes based on formal and relational enforcements emerge endogenously and are linked dynamically with the process of economic development formal contracts are enforced by third party institutions courts whereas relational contracts are self enforcing agreements without third party involvement the novel feature of our model is that it demonstrates the co evolution of these different enforcement modes and market equilibrium conditions all of which are jointly determined we then characterise the equilibrium paths of such dynamic processes and show the time structure of relational contracting in the process of development in particular we show that relational contracting fosters the emergence of a market based economy in the growth phase of development however its role declines as the economy enters a mature phase

informal insurance arrangements with limited commitment theory and evidence from village economies recent work on consumption allocations in village economies finds that idiosyncratic variation in consumption is systematically related to idiosyncratic variation in income thus rejecting the hypothesis of full risk pooling we attempt to explain these observations by adding limited commitment as an impediment to risk pooling we provide a general dynamic model and completely characterise efficient informal insurance arrangements constrained by limited commitment and test the model using data from three indian villages we find that the model can fully explain the dynamic response of consumption to income but that it fails to explain the distribution of consumption across households

credit markets in northern nigeria credit as insurance in a rural economy this article addresses the issues of imcomplete markets and imperfect information in the context of credit markets in rural northern nigeria in much recent theoretical literature the problems of moral hazard and adverse selection are assumed to be decisive for the organization of agrarian institutions in contrast it is found that in the four villages surveyed credit transactions take advantage of the free flow of information within rural communities information asymmetries between borrower and lender are unimportant and their institutional consequences the use of collateral and interlinked contracts are absent credit transactions play a direct role in pooling risk between households through the use of contracts in which the repayment owed by the borrower depends on the realization of random production shocks by both the borrower and the lender

who gets the job referral evidence from a social networks experiment we use recruitment into a laboratory experiment in kolkata india to analyze how job networks select individuals for employment opportunities we present evidence that individuals face a tradeoff between choosing the most qualified individual for the job and the individual who is ideal from the perspective of their social network the experiment allows randomly selected subjects to refer members of their social networks to subsequent rounds of the experiment and varies the incentive schemes offered to these participants we find that when faced with performance pay individuals are more likely to refer co workers and less likely to refer family members high ability participants who are offered performance pay recruit referrals who perform significantly better on a cognitive ability task and also prove to be more reliable as evidenced by their choices in the trust game and performance on an effort task

forecasting efficiency concepts and applications this article introduces the concept of forecast efficiency in which the forecast contains all information available at the time of the forecast empirical tests investigate weak efficiency where the information set is all past forecasts and where all forecast revisions and errors should be uncorrelated with past forecast revisions tests of macroeconomic energy consumption and oil price forecasts find a significant autocorrelation of forecast revisions with fifty of fifty one tests showing positive correlation of forecast revisions as opposed to zero correlation consistent with forecast efficiency copyright 1987 by mit press

targeting the poor evidence from a field experiment in indonesia the brief summarizes the targeting the poor evidence from a field experiment in indonesia for the period december 2008 january 2009 this paper reports an experiment in 640 indonesian villages on three approaches to target the poor proxy means tests pmt where assets are used to predict consumption community targeting where villagers rank everyone from richest to poorest and a hybrid defining poverty based on ppp 2 per capita consumption community targeting and the hybrid perform somewhat worse in identifying the poor than pmt though not by enough to significantly affect poverty outcomes for a typical program elite capture does not explain these results instead communities appear to apply a different concept of poverty

the formation of risk sharing networks this paper examines the formation of risk sharing networks in the rural philippines we find that geographic proximity possibly correlated with kinship is a major determinant of mutual insurance links among villagers age and wealth differences also play an important role in contrast income correlation and differences in occupation are not determinants of network links reported network links have a strong effect on subsequent gifts and loans gifts between network partners are found to respond to shocks and to differences in health status from this we conclude that intra village mutual insurance links are largely determined by social and geographical proximity and are only weakly the result of purposeful diversification of income risk the paper also makes a methodological contribution to the estimation of dyadic models

the forecast accuracy of individual analysts evidence of systematic optimism and pessimism o brien 1990 examines the annual earnings forecast accuracy of individual analysts reporting to the institutional brokers estimate system ibes of lynch jones and ryan during july 1975 september 1982 using a regression model which adjusts for average firm and year effects o brien finds no evidence of differential forecast accuracy comparing individual analysts earnings forecasts to median consensus forecasts during 1983 86 we also find no statistically significant evidence of differential analyst forecast accuracy our result however does not mean that one analyst s forecasts are much like another s we find that analysts are persistently optimistic or pessimistic relative to consensus forecasts we examine this persistent behavior and its effect on measures of forecast accuracy over a sample

financial markets forecasts revisited are they rational stubborn or jumpy this paper evaluates professional forecasters behavior using a panel data of individual forecasts we find that i professional forecasts are behavioral and ii there exists a stock bond dissonance the forecasting behavior seems to be stubborn in the stock market but jumpy in the bond market even in the same country forecasting behavior is quite different by market

politician family networks and electoral outcomes evidence from the philippines we demonstrate the electoral importance of politician family networks and provide evidence of the mechanisms behind the relationship we use a 20 million person dataset allowing us to reconstruct intermarriage networks for over 15 000 villages in 709 municipalities in the philippines we show that politicians are disproportionately drawn from more central families and that controlling for candidate fixed e ects candidates receive a higher vote share in villages where their families are more central we present evidence that centrality confers organizational and logistical advantages that facilitate clientelistic transactions such as vote buying and do not operate through popularity name recognition or through the choice of policies more aligned with their constituents preferences

peer effects and social networks in education this paper studies whether structural properties of friendship networks affect individual outcomes in education we first develop a model that shows that at the nash equilibrium the outcome of each individual embedded in a network is proportional to her katz bonacich centrality measure this measure takes into account both direct and indirect friends of each individual but puts less weight to her distant friends we then bring the model to the data by using a very detailed dataset of adolescent friendship networks we show that after controlling for observable individual characteristics and unobservable network specific factors the individual s position in a network as measured by her katz bonacich centrality is a key determinant of her level of activity a standard deviation increase in the katz bonacich centrality increases the pupil school performance by more than 7 percent of one standard deviation

using survey data to correct the bias in policy expectations extracted from fed funds futures many studies estimate risk premiums on federal funds futures to extract monetary policy expectations by assuming that average forecast errors of the expectations are zero or that survey forecasts are good proxies for the expectations these assumptions however may fail due to an unanticipated declining trend in the federal funds rate and to survey respondents strategic behavior consequently the premiums estimated under these assumptions may be biased we propose a new method to estimate the premiums and find that the premiums have been often negative since 2000 which is generally consistent with the negative betas observed in the 2000s

acquiring information through peers we develop an endogenous network formation model in which agents form connections to acquire information our model features complementarity in actions as agents care not only about accuracy of their decision making but also about the actions of other agents in equilibrium the information structure is a hierarchical network and under weakly convex cost of forming links the equilibrium network is core periphery although agents are ex ante identical there is ex post heterogeneity in payoffs and actions

strategic behaviours in international telecommunications system abstract in this paper the international telecommunication market is analysed in order to evaluate the impact of different strategic behaviours of telecommunications carriers using the nash fixed threat bargaining model we formalize the carriers bargaining behaviour in a growing competitive pressure market the effect of competition is considered both in the final market and in the intermediate one in which carriers compete on tariffs to get an appropriate distribution of profits we show that carriers may have an incentive to a cooperative behaviour in the setting of tariffs and the results of such behaviour in terms of final prices depends upon the competitive pressure degree they are subject

local inequality and project choice theory and evidence from ecuador this paper provides evidence consistent with elite capture of social fund investment projects in ecuador exploiting a unique combination of data sets on village level income distributions social fund project administration and province level electoral results we test a simple model of project choice when local political power is unequally distributed in accordance with the predictions of the model poorer villages are more likely to receive projects that provide excludable private goods to the poor such as latrines controlling for poverty more unequal communities are less likely to receive such projects consistent with the hypothesis of elite capture these results are sensitive to the specific measures of inequality and elite power used in the empirical analysis and are strongest for expenditure shares at the top of the distribution

a theory of dynamic oligopoly ii price competition kinked demand curves and edgeworth cycles we provide game theoretic foundations for the classic kinked demand curve equilibrium and edgeworth cycle we analyze a model in which firms take turns choosing prices the model is intended to capture the idea of reactions based on short run commitment in a markov perfect equilibrium mpe a firm s move in any period depends only on the other firm s current price there are multiple mpe s consisting of both kinked demand curve equilibria and edgeworth cycles in any mpe profit is bounded away from the bertrand equilibrium level we show that a kinked demand curve at the monopoly price is the unique symmetric renegotiation proof equilibrium when there is little discounting we then endogenize the timing by allowing firms to move at any time subject to short run commitments we find that firms end up alternating thus vindicating the ad hoc timing assumption of our simpler model we also discuss how the model can be enriched to provide explanations for excess capacity and market sharing keiiwords tacit collusion markov perfect equilibrium kinked demand curve edgeworth cycle excess capacity market sharing endogenous timing

how does development assistance affect collective action capacity results from a field experiment in post conflict liberia social cooperation is critical to a wide variety of political and economic outcomes for this reason international donors have embraced interventions designed to strengthen the ability of communities to solve collective action problems especially in post conflict settings we exploit the random assignment of a development program in liberia to assess the effects of such interventions using a matching funds experiment we find evidence that these interventions can alter cooperation capacity however we observe effects only in communities in which by design both men and women faced the collective action challenge focusing on mechanisms we find evidence that program effects worked through improvements in mobilization capacity that may have enhanced communities ability to coordinate to solve mixed gender problems these gains did not operate in areas where only women took part in the matching funds experiment possibly because they could rely on traditional institutions unaffected by the external intervention the combined evidence suggests that the impact of donor interventions designed to enhance cooperation can depend critically on the kinds of social dilemmas that communities face and the flexibility they have in determining who should solve them

financial analyst characteristics and herding behavior in forecasting this study classifies analysts earnings forecasts as herding or bold and finds that 1 boldness likelihood increases with the analyst s prior accuracy brokerage size and experience and declines with the number of industries the analyst follows consistent with theory linking boldness with career concerns and ability 2 bold forecasts are more accurate than herding forecasts and 3 herding forecast revisions are more strongly associated with analysts earnings forecast errors actual earnings forecast than are bold forecast revisions thus bold forecasts incorporate analysts private information more completely and provide more relevant information to investors than herding forecasts

herd behavior of japanese economists abstract this paper analyzes herding by japanese macroeconomic forecasters we find that japanese forecasters herd together regardless of their age in comparison lamont 1995 finds that older american forecasters stop herding

why are professional forecasters biased agency versus behavioral explanations professional forecasters may not simply aim to minimize expected squared forecast errors in models with repeated forecasts the pattern of forecasts reveals valuable information about the forecasters even before the outcome is realized rational forecasters will compromise between minimizing errors and mimicking prediction patterns typical of able forecasters simple models based on this argument imply that forecasts are biased in the direction of forecasts typical of able forecasters our models of strategic bias are rejected empirically as forecasts are biased in directions typical of forecasters with large mean squared forecast errors this observation is consistent with behavioral explanations of forecast bias

reading the tea leaves model uncertainty robust forecasts and the autocorrelation of analysts forecast errors abstract we put forward a model in which analysts are uncertain about a firm s earnings process faced with the possibility of using a misspecified model analysts issue forecasts that are robust to model misspecification we estimate that this mechanism explains approximately 60 of the autocorrelation in analysts forecast errors the remainder stems from the cross sectional variation in mean forecast errors and in analysts estimation errors of the persistence of earnings growth shocks consistent with our model we find that analysts learn about some features of the earnings process but not others and this learning reduces but does not eliminate the autocorrelation of forecast errors as firms age other potential explanations for the autocorrelation of analyst forecast errors are rejected our model of robust forecasting applies not only to analysts forecasts but also to all model based forecasts

social connections and group banking lending to the poor is expensive due to high screening monitoring and enforcement costs group lending advocates believe lenders overcome this by harnessing social connections using data from finca peru i exploit a quasi random group formation process to find evidence of peers successfully monitoring and enforcing joint liability loans individuals with stronger social connections to their fellow group members i e either living closer or being of a similar culture have higher repayment and higher savings furthermore i observe direct evidence that relationships deteriorate after default and that through successful monitoring individuals know who to punish and who not to punish after default

herding in analysts recommendations the role of media abstract this study investigates the impact of media on analysts herding behavior when making stock recommendations we find three main results first we find that analysts herd less when stocks are covered more in the media second when the firm has negative media sentiment analysts tend to herd more third higher disagreement in the media is associated with a higher tendency to herd among analysts these findings are robust to the confounding effect of news flows on returns as well as to alternative explanations in addition we find that the effect of media on the herding behavior is conditional on analyst characteristics

do analysts herd an analysis of recommendations and market reactions this article develops and implements a new test to investigate whether sell side analysts herd around the consensus when they make stock recommendations our empirical results support the herding hypothesis stock price reactions following recommendation revisions are stronger when the new recommendation is away from the consensus than when it is closer to it indicating that the market recognizes analysts tendency to herd we find that analysts from larger brokerages analysts following stocks with smaller dispersion across recommendations and analysts who make less frequent revisions are more likely to herd the author 2009 published by oxford university press on behalf of the society for financial studies all rights reserved for permissions please e mail journals permissions oxfordjournals org oxford university press

risk aversion uncertain information and market efficiency abstract this paper develops and tests the uncertain information hypothesis as a means of explaining the response of rational risk averse investors to the arrival of unanticipated information the theory predicts that following news of a dramatic financial event both the risk and expected return of the affected companies increase systematically and that prices react more strongly to bad news than good an empirical investigation of over 9000 marketwide and firm specific events produces results consistent with these predictions we conclude that the market reacts to uncertain information in an efficient if not instantaneous manner

predicting individual analyst earnings forecasts in this study i propose and test a model that predicts individual analyst forecasts of corporate earnings per share eps using the change in the mean consensus forecast of other analysts since the date of the analyst s current outstanding forecast the deviation of the analyst s current forecast from the consensus forecast and cumulative stock returns since the date of the analyst s current forecast i find that these three variables explain about 38 of the variability in analyst forecast revisions while there is evidence of a relation between changes in earnings expectations and price changes virtually all of the explanatory power of my model arises from other analyst forecasts section 2 describes the data bases used and the sample selection process section 3 presents the model and method for predicting individual analyst forecasts section 4 reports the bias and accuracy of the predicted forecasts conclusions are in section 5

reshaping institutions evidence on aid impacts using a pre analysis plan this brief summarizes the results of a gender impact evaluation study entitled reshaping institutions evidence on aid impacts using a pre analysis plan conducted between 2005 and 2009 in sierra leone the study observed the impact of pre analysis plan pap on local institutions by imposing participation requirements for marginalized groups including women and test for learning by doing effects in sierra leone on the individual and village level requiring women and young adults to take on leadership positions participate in project meetings and sign off on project finances does not have any persistent effect on their participation in local decision making or attitudes regarding leadership ability the project successfully established village organizations and tools to manage the project the distributions of the project s benefits were equitable and leakage was minimal there was a significant positive impact on the stock and quality of local public infrastructure however there are no detectible changes in the ability to raise funds for local public goods decision making process or social norms and attitudes funding for the study derived from the gobifo project the institutional reform and capacity building project ircbp the world bank development impact evaluation dime the horace w goldsmith foundation the international growth center 3ie and the national bureau of economic research nber african successes project

is the french mobile phone cartel really a cartel abstract france telecom ft sfr and bouygues telecom bt have been fined by france s conseil de la concurrence cc for organizing a mobile phone cartel with stable market shares one half one third and one sixth respectively and for directly exchanging commercial information while not contesting the legal decision it is argued here that the economic reasoning is flawed 1 as the cc made much of the firms stable market shares we have first followed this line of reasoning by considering that the market shares are quotas under uniform costs even if there is a general incentive to form a monopolistic cartel bt was too small for it to be worth its while to join it it is not necessary to exchange information directly to coordinate market shares and prices effectively all partial cartels are unlikely 2 we then departed from the cc by considering that the non uniform market shares are explained by the costs in cournot competition this allows costs to be deduced from the observed market shares by assuming that they are kept the same when switching from cournot competition to any form of cartel we deduced that market shares cannot be other than stable and non uniform any monopoly is unlikely to come about because ft has negative incentives to form a monopolistic cartel no partial cartels of two operators are viable because at least one member would lose out the paper also shows that stackelberg competition is unlikely as well as bertrand edgeworth competition in conclusion cournot competition is the only arrangement that guarantees no losses to all operators

do household definitions matter in survey design results from a randomized survey experiment in mali abstract household definitions used in multi topic household surveys vary between surveys but have potentially significant implications for household composition production and poverty statistics standard definitions of the household usually include some intersection of keywords relating to residency requirements common food consumption and intermingling of income or production decisions despite best practices intending to standardize the definition of the household it is unclear which types of definitions or which intersections of keywords in a definition result in different household compositions this paper conducts a randomized survey experiment of four different household definitions in mali to examine the implications for household level statistics this approach permits analysis of the trade offs between alternative definition types we find that additional keywords in definitions increase rather than decrease household size and significantly alters household composition definitions emphasizing common consumption or joint production increase estimates of the levels of household assets and consumption statistics but not on per adult equivalency asset and consumption statistics relative to open ended definitions of the household in contrast definition type did not affect production statistics in levels though we observe significant differences in per adult equivalency terms our findings suggest that variations in household definition have implications for measuring household welfare and production

can good projects succeed in bad communities abstract the lack of social capital is frequently given as an explanation for why communities perform poorly yet to what extent can project design compensate for these community specific constraints i address this question by examining determinants of collective success in a costly problem for developing economies the upkeep of local public goods it is often difficult to obtain reliable outcome measures for comparable collective tasks across well defined communities in order to address this i conducted detailed surveys of community maintained infrastructure projects in northern pakistan the findings show that while community specific constraints do matter their impact can be mitigated by better project design inequality social fragmentation and lack of leadership in the community do have adverse consequences but these can be overcome by changes in project complexity community participation and return distribution moreover the evidence suggests that better design matters even more for communities with poorer attributes the use of community fixed effects and instrumental variables offers a significant improvement in empirical identification over previous studies these results provide evidence that appropriate design can enable projects to succeed even in bad communities

why so much error in analysts earnings forecasts wall street analysts tend to be too optimistic about the earnings prospects of companies they follow the average consensus 12 month eps growth forecast is 17 7 percent which is more than twice the actual growth rate in aggregate forecasts are 11 2 percent above actual earnings at the start of a year and are revised downward continuously in the course of the year for the full study period reported here the percentage of 12 month earnings estimates revised downward exceeded the percentage revised upward on average by 4 4 percent every month since 1993 however the quality of analyst forecasts seems to have improved this article provides an intuitive explanation of the change and suggests ways in which analysts can use the explanation to improve portfolio performance

aid under fire development projects and civil conflict we estimate the causal effect of a large development program on conflict in the philippines through a regression discontinuity design that exploits an arbitrary poverty threshold used to assign eligibility for the program we find that barely eligible municipalities experienced a large increase in conflict casualties compared to barely ineligible ones this increase is mostly due to insurgent initiated incidents in the early stages of program preparation our results are consistent with the hypothesis that insurgents try to sabotage the program because its success would weaken their support in the population

social capital and social quilts network patterns of favor exchange we examine the informal exchange of favors in societies such that any two individuals interact too infrequently to sustain exchange but such that the social pressure of the possible loss of multiple relationships can sustain exchange patterns of exchange that are locally enforceable and renegotiation proof necessitate that all links are supported any two individuals exchanging favors have a common friend in symmetric settings such robust networks are social quilts tree like unions of completely connected subnetworks examining favor exchange networks in 75 villages in rural india we find high levels of support and identify characteristics that correlate with support

network structure and the aggregation of information theory and evidence from indonesia abstract we use unique data from over 600 indonesian communities on what individuals know about the poverty status of others to study how network structure influences information aggregation we develop a model of semi bayesian learning on networks which we structurally estimate using within village data the model generates qualitative predictions about how cross village patterns of learning relate to network structure which we show are borne out in the data we apply our findings to a community based targeting program where citizens chose households to receive aid and show that the networks that the model predicts to be more diffusive differentially benefit from community targeting jel d14 d83 d85 i32 o12 z13

networks markets and inequality julien gagnon thanks the gates cambridge trust for financial support sanjeev goyal is grateful to the keynes fellowship and the cambridge inet institute for financial support

anchoring effects evidence from art auctions in order to separate anchoring where an irrelevant message has an effect on the outcome from rational learning where past prices are not irrelevant because they may be used to estimate unobservable quality we use the following strategy we first develop a hedonic prediction of price for both the current sale e g the 2006 sale and the previous sale these hedonic predic tions are based on observable characteristics of each painting and an index of overall prices we then regress actual sale price on our hedonic prediction on the difference between the actual price in the previous sale and our hedonic prediction this expression tests for anchoring and on the difference between the actual price in the previous sale and our hedonic prediction of price in the previous sale this expression controls for unobservable characteristics the test for anchor ing is the extent to which the actual price in the previous sale affects the current sale price we can identify anchoring from other effects because the demand for art which is captured by the average overall price index changes over time whereas the unobservable component of qual ity is assumed to remain constant between auctions this allows us to control for unobserved quality characteristics as long as something drastic has not happened between sales such as a painting has been deemed a fake which is a very rare occurrence the assumption of constant quality is a realistic one

trust and social collateral this paper builds a theory of trust based on informal contract enforcement in social networks in our model network connections between individuals can be used as social collateral to secure informal borrowing we define network based trust as the largest amount one agent can borrow from another agent and derive a reduced form expression for this quantity which we then use in three applications 1 we predict that dense networks generate bonding social capital that allows transacting valuable assets whereas loose networks create bridging social capital that improves access to cheap favors such as information 2 for job recommendation networks we show that strong ties between employers and trusted recommenders reduce asymmetric information about the quality of job candidates 3 using data from peru we show empirically that network based trust predicts informal borrowing and we structurally estimate and test our model

power to the people evidence from a randomized field experiment on community based monitoring in uganda this brief summarizes the results of a gender impact evaluation study entitled power to the people evidence from a randomized field experiment on community based monitoring in uganda intervention started in 2004 and consisted of a training and a six month follow up in uganda the study observed that localized nongovernmental organizations encouraged communities to be more involved with the state of health service provision and strengthened their capacity to hold their local health providers to account for performance the community based monitoring project increased the quality and quantity of primary health care provision the program led to a significant increase in the weight of infants by 14 z scores and a significant decrease in child mortality by 33 utilization of outpatient services was significantly higher 20 percent in the treatment group and the overall effect across utilization measures is large and significant funding for the study derived from bank netherlands partnership program world bank research committee world bank africa region division swedish international development agency department for research cooperation

the informational role of bond analysts this study uses a large sample of sell side bond analysts reports to examine the properties of recommendations provided by bond analysts and the impact of these recommendations on bond securities first we document that the distribution of bond analysts buy hold and sell recommendations is skewed positively but less so than the distribution of equity analysts recommendations the positive skewness in bond analysts recommendations is greater for

strategic planning for long distance telecommunications a symbiotic production system telephone services and other forms of telecommunication services involve a form of production with peculiar characteristics in this paper a symbiotic production model to analyse international telecommunication market is introduced and using conjectural variations the carriers strategic behaviour in a growing competitive pressure market is formalized the effect of competition is analysed both between carriers in the final market and in the intermediate market in which carriers compete over tariffs to get an appropriate distribution of profits the obtained results show the firms have an incentive to cooperate or to collude depending upon the conjectural variations and individuate some policy implications for the international telecommunication market

reputation and performance among security analysts members of the institutional investor all american research team supply more accurate earnings forecasts than other analysts when forecasts are matched by the corporation followed and by the date of brokerage house issuance this contemporaneous advantage is complemented by a timing advantage all americans supply forecasts more often than other analysts stocks returns immediately following large upward forecast revisions suggest that all americans impact prices more than other analysts however there is virtually no difference in returns following large downward revisions nevertheless the collective results suggest a positive relation between reputation and performance and assuming that all americans are better paid pay and performance

revision of industrial supply conditions and game theory abstract we analyze the real case of two firms evaluating a shift from a risk and revenue sharing agreement to a supplying agreement from the point of view of economic theory this is a constrained bilateral monopoly problem at the first stage the two firms take sequential decisions of price and demand with price being represented not only as a simple level but also as a more realistic price schedule in this more general case we solve a variational problem by transforming it with no restrictions into a classical mathematical programming one at the second stage the two firms are allowed to bargain over a couple price quantity instead of taking separate decisions about them as expected bargaining is efficient with respect to the constant price case in the price schedule case however efficiency does not hold without further conditions

pricing in revenue management for multiple firms competing for customers abstract we consider the pricing strategies of multiple firms providing the same service in competition for a common pool of customers in a revenue management context the firms have finite capacity and the demand at each firm depends on the selling prices charged by all firms each of which satisfies demand up to a given capacity limit we use game theory to analyze the systems when firms face either a deterministic demand or a general stochastic demand the existence and uniqueness conditions of a nash equilibrium are derived and we calculate the explicit nash equilibrium point when the demand at each firm is a linear function of price we also conduct sensitivity analysis of the equilibrium prices with respect to cost and capacity parameters

inequality reciprocity and credit in social networks while informal insurance and social networks are important in all societies networks are critical in rural areas of developing countries townsend 1994 was one of the first to document the importance of risk sharing within villages more recently theorists have begun to model sharing as taking place within a network rather than within the village as a whole bramoulle and kranton 2007 bloch genicot and ray 2008 ambrus mobius and szeidl 2010 empirical studies have also shown the importance of risk sharing within social networks rosenzweig 1988 udry 1994 de weerdt and dercon 2006 given this local nature of risksharing within networks it is important to analyze who forms links with whom and the types of relationships formed the effects of development policies will depend on the operation of social networks and the features that cause individuals to form links research on the determinants of risk sharing links has found contradictory results experimental studies such as attanasio et al 2009 find that risk sharing groups are assortative on consumption survey based evidence such as de weerdt 2004 and fafchamps and gubert 2007 find laura schechter is an assistant professor of economics at michigan state university alex yuskavage is a financial economist in the office of tax analysis at the u s treasury schechter thanks the wisconsin alumni research foundation the russell sage foundation and the delta foundation for funding we are grateful to idelin molinas and instituto desarrollo for their support in paraguay jennifer alix garcia joachim de weerdt garance genicot paul niehaus mark rosenzweig and guanming shi gave helpful comments

retail gasoline price cycles across spatially dispersed gasoline stations abstract studies of volatility in retail gasoline prices have used either weekly averages of the prices at a small subset of stations in a city or daily observations on prices at a small number of stations this paper uses daily observations on station specific prices within a large canadian metropolitan area to address whether weekly average prices or prices for a small number of stations provide an accurate description of pricing in a market with volatility this paper considers whether researchers using restricted data can draw meaningful conclusions about the appropriate theoretical model and the policy response to allegations of anticompetitive behavior

collusion among asymmetric firms the case of different discount factors abstract this study investigates collusive behavior among asymmetric firms for this purpose we develop a selection criterion for deriving a unique collusive outcome and apply it to the case when firms have different discount factors our analysis reveals that for collusion to be self enforcing it is unnecessary that all firms have sufficiently high discount factors but rather only that firms on average have a sufficiently long run view the optimal collusive outcome entails a strict ordering of output quotas in which firms with relatively low discount factors receive a disproportionate share of market demand as found in the case of a common discount factor a fall in a firm s discount factor reduces the likelihood of successful collusion this effect reduces firm profits on the other hand in the event that firms can collude a lowering of a firm s discount factor increases its output quota so that its profits rise

herding among security analysts the paper shows that the buy or sell recommendations of security analysts have a signi cant positive in uence on the recommendations of the next two analysts this in uence can be traced to short lived information in the most recent revisions in contrast the in uence of the prevailing consensus is not stronger if the consensus accurately forecasts subsequent stock price movements this indicates consensus herding consistent with models in which analysts herd based on little information the consensus also has a stronger in uence when market conditions are favorable the resulting poorer information aggregation could cause bull markets to be intrinsically more fragilea e g bikhchandani et al j political economy 100 5 1992 992 1026 2000 elsevier science s a all rights reserved jel classixcation g11 g14 g24

us food aid and civil conflict we study the effect of us food aid on conflict in recipient countries our analysis exploits time variation in food aid shipments due to changes in us wheat production and cross sectional variation in a country s tendency to receive any us food aid according to our estimates an increase in us food aid increases the incidence and duration of civil conflicts but has no robust effect on interstate conflicts or the onset of civil conflicts we also provide suggestive evidence that the effects are most pronounced in countries with a recent history of civil conflict jel d74 f35 o17 o19 q11 q18 we are unable to determine whether our aid helps or hinders one or more parties to the conflict it is clear that the losses particularly looted assets constitutes a serious barrier to the efficient and effective provision of assistance and can contribute to the war economy this raises a serious challenge for the humanitarian community can humanitarians be accused of fueling or prolonging the conflict in these two countries medecins sans frontieres amsterdam 1

the comparative productivity efficiency for global telecoms abstract this paper reconciles diverse efficiency measures to characterize the productivity efficiency of 39 forbes 2000 ranked leading global telecom operators productivity efficiency ratings should be considered as a key element for achieving greater business performance and better market position this study applies the data envelopment analysis dea approach with the classical radial measure a p efficiency measure and efficiency achievement measure respectively combining multiple outputs and inputs to measure the magnitude of performance differences between leading telecom carriers empirical results indicate that top ranked forbes telecom operators are not the same as those having top ranked ccr efficiency measures the results show that about 20 5 of forbes 2000 telecom operators are operating on the best practice frontier for ccr efficiency measure while only 7 7 match the efficiency achievement measure criteria this study also shows that asia pacific telecom operators have better productivity efficiency than those in europe and america but the differences are not significant another interesting find is that the state owned telcos as a group show a relatively higher scoring than the privatized telcos as a group because they maintain full service fixed line mobile and internet operations as compared to maintaining fixed only or mobile only operations except china but the differences are not significant it has been concluded that competition in the global telecom market will continue to be tied to the enhanced productivity efficiency

consumption risk sharing in social networks we develop a model of informal risk sharing in social networks where relationships between individuals can be used as social collateral to enforce insurance payments we characterize incentive compatible risk sharing arrangements and obtain two results 1 the degree of informal insurance is governed by the expansiveness of the network measured by the number of connections that groups of agents have with the rest of the community relative to group size twodimensional networks where people have connections in multiple directions are su ciently expansive to allow very good risk sharing we show that social networks in peruvian villages satisfy this dimensionality property thus our model can explain townsend s 1994 puzzling observation that village communities often exhibit close to full insurance 2 in second best arrangements agents organize in endogenous risk sharing islands in the network where shocks are shared fully within but imperfectly across islands as a result network based risk sharing is local socially closer agents insure each other more

can development aid contribute to social cohesion after civil war evidence from a field experiment in post conflict liberia civil war is very common in the develop ing world with harmful welfare effects when it occurs many fear that the devastation wrought by violent conflict destroys social capital impedes economic development and leads to the recur rence of violence paul collier et al 2003 in response donors are injecting large amounts of aid into post conflict countries a significant share of this assistance is spent on community driven reconstruction cdr programs which support the establishment of new local institu tions in order to promote social reconciliation whether this assistance has this effect is how ever largely unknown can brief foreign funded efforts to build local institutions in fact have posi tive effects on local patterns of cooperation we address this question using a randomized field experiment to evaluate the impact of a cdr project in northern liberia the project was funded by the united kingdom s department for international development dfid and imple mented by the international rescue committee irc the project attempted to build demo cratic community level institutions for making and implementing decisions about local public goods this model of support for participatory processes to enhance local public goods provi

security analysts career concerns and herding of earnings forecasts several theories of reputation and herding see e g scharfstein and stein 1990 suggest that herding among agents should vary with career concerns our goal in this paper is to document whether such a link exists in the labor market for security analysts specifically we look at the relationship between an analyst s job tenure a proxy for career concerns and various measures of stock earnings forecast performance we establish the following key results 1 older analysts are more likely to produce earnings forecasts of firms before younger ones 2 their forecasts also deviate more from the consensus forecast than their younger counterparts we argue that these results are consistent with some reputational models of herding we also establish a number of auxiliary findings regarding the relationship between forecast accuracy and frequency of forecast revisions with job tenure

testing the rationality of japanese gdp forecasts the sign of forecast revision matters abstract this paper analyzes the rationality of japanese gdp forecasts of individual economists it finds that japanese forecasters are pessimistic optimistic when their forecast revisions frs are positive negative and that they always over react to new information across forecasters the magnitude of average fr is not correlated with the magnitude of average forecast errors fe these results together are consistent with neither the rational expectations hypothesis nor reputation models with rational and strategic forecasters