corruption and government size a disaggregated analysis using annual state level data over 1983 1987 this paper examines the effect of government size on corruption by public officials by including both demand and supply side incentives for engaging in corrupt practices our objectives are twofold first we assess the relationship between the incidence of corruption and overall measures of the size of the federal government and the state local sector in each state second we explore what kinds of government activities are more likely to be successful in deterring abuse of public office our results are generally supportive of becker s crime and punishment model regarding the primary focus of the paper our results show that government size in particular spending by state governments does indeed have a strong positive influence on corruption

public goods in networks this paper considers incentives to provide goods that are non excludable along social or geographic links we find first that networks can lead to specialization in public good provision in every social network there is an equilibrium where some individuals contribute and others free ride in many networks this extreme is the only outcome second specialization can benefit society as a whole this outcome arises when contributors are linked collectively to many agents finally a new link increases access to public goods but reduces individual incentives to contribute hence overall welfare can be higher when there are holes in a network

attack defence and contagion in networks sanjeev goyal acknowledges support from a keynes fellowship cambridge inet institute and european research area complexity net resilience and interaction of networks in ecology and economics adrien vigier acknowledges support from a gates cambridge fellowship as well as a core fellowship from universite catholique de louvain

taste for diversity and the optimality of economic growth abstract we disentangle the taste for diversity in consumption present in endogenous growth models with expanding product variety from the elasticity of substitution between consumption goods this seriously affects the welfare analysis of the model if taste for diversity is relatively small the market rate of growth may be suboptimally large

corruption in russia abstractwe analyze the determinants of corruption in russia using law enforcement data on corruption incidents for a panel of 79 russian regions for the period 2004 13 we find that the relative salaries of bureaucrats determine corruption levels corruption declines as relative salaries rise yet at strongly diminishing rates furthermore we show that even very limited media freedom helps to curtail corruption other important determinants are the strength of law enforcement education levels and unemployment rates

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

network security and contagion abstract we develop a theoretical model of security investments in a network of interconnected agents network connections introduce the possibility of cascading failures due to an exogenous or endogenous attack depending on the profile of security investments by the agents we provide a tractable decomposition of individual payoffs into an own effect and an externality which also enables us to characterize individual investment incentives recursively by considering the network with one agent removed at a time using this decomposition we provide characterization of equilibrium and socially optimal investment levels as a function of the structure of the network highlighting the role of a new set of network centrality measures in shaping the levels of equilibrium and optimal investments when the attack location is endogenized by assuming that the attacker chooses a probability distribution over the location of the attack in order to maximize damage similar forces still operate but now because greater investment by an agent shifts the attack to other parts of the network the equilibrium may involve too much investment relative to the social optimum

individual security contagion and network design sanjeev goyal and diego cerdeiro were supported by european research area complexity net http www complexitynet eu through grant resilience and interaction of networks in ecology and economics resinee diego cerdeiro acknowledges financial support from queens college and the cambridge overseas trust marcin dziubinski was supported by the strategic resilience of networks project realized within the homing plus programme of the foundation for polish science co financed by the european union from the regional development fund within operational programme innovative economy grants for innovation sanjeev goyal acknowledges financial support from a keynes fellowship and the cambridge inet institute

property rights public enforcement and growth we study the link between public enforcement of property rights innovation investments and economic growth in an endogenous growth framework with an expanding set of product varieties we find that a government can assure positive equilibrium growth through public employment in the enforcement of property rights if the economic environment is sufficiently favorable to growth and or if public enforcement is sufficiently effective however in terms of welfare an equilibrium path without property rights protection and growth might be preferable in this case the enforcement of property rights involves too much reallocation of labor from production and research towards the public sector

prosperity without conflict abstract social conflict and slow growth are features of many developing economies this paper considers the role institutions of property rights and conflict management can play in both achieving prosperity and mitigating conflict in these economies we study how introducing conflict over economic distribution into an otherwise standard model of growth can shape optimal second best taxation policy when diversionary activities cannot be taxed in this context we find that the maximization of economic efficiency may call for a reduction in growth in order to mitigate the problem of diversion even though the economy s growth is inefficiently slow in the absence of taxation this is so when institutional quality is sufficiently poor but not otherwise the paper warns against the conventional justification of growth promoting policies on efficiency grounds independently of institutions

is there always too little research in endogenous growth with expanding product variety abstract it is generally believed that models of endogenous growth with expanding product variety typically yield a too low level of research we show here that this result is due to the implicit choice of a particular value for a crucial parameter once this parameter is set free one finds that too much research can occur as well

the social efficiency of private decisions to enforce property rights costs must be incurred if an owner is to enforce private property rights effectively we show that in a perfectly competitive economy private decisions to enforce rights may result in either more or less enforcement than is socially efficient cases of multiple stable equilibria occur and an equilibrium may be locally but not globally efficient resources may not be employed in their socially most valuable uses and enforcement may be accompanied by inefficient investment in resource productivity

effective property rights conflict and growth abstract this paper shows how the interaction between conflict and growth can give rise to a nonmonotone relationship between property rights and social welfare this interaction is illustrated in a model of endogenous growth in which equilibrium diversion of resources is the cost of securing effective property rights a symmetric equilibrium allocation associated with more secure property rights and faster growth can be pareto dominated by one associated with poorer property rights and slower growth faster growth can exacerbate the problem of diversion whenever property rights are sufficiently poor these results call for caution before a society decides to pursue economic growth independently of the institutional structure of property rights furthermore if this structure is inappropriate piecemeal reform might not be in the interest of society and a substantial reform might be necessary if it is to be welfare improving

optimal protection of property rights in a general equilibrium model of growth we incorporate weak property rights into an otherwise standard general equilibrium model of growth and second best optimal policy in this setup the state plays two of its key roles it protects property rights and provides public services the government chooses policy the income tax rate as well as the allocation of collected tax revenues between law enforcement and public services to maximize the growth rate of the economy the focus of our analysis is on how weak property rights generate multiple decentralized competitive equilibria the different properties of these equilibria and the implications of second best optimal policies

bureaucratic corruption and the rate of temptation do wages in the civil service affect corruption and by how much abstract this paper presents what is to our knowledge the first empirical estimate of the effect of pay in the civil service on corruption first we show that theory is ambiguous on the relationship between civil service pay and corruption then we examine the issue using a new data set on wages for low income countries we find evidence of a statistically and economically significant relationship between relative civil service pay and corruption in regressions based on cross country averages where we control for a wide array of variables the relationship implies that a rather large increase in wages is required to eradicate corruption solely by raising wages

externalities and compulsary vaccinations abstract this paper challenges the conventional wisdom that because of the free rider problem a case can be made for compulsary vaccination against infectious disease for a very general class of models requiring that all individuals be vaccinated is strictly dominated by free choice the market allocation is not optimum and in the full information optimum some individuals would be compelled to be vaccinated this allocation can be achieved by taxes and subsidies however the government can exploit the revelation properties of vaccination and achieve an even better allocation than the full information optimum

a strategic model of social and economic networks we study the stability and efficiency of social and economic networks when self interested individuals can form or sever links first for two stylized models we characterize the stable and efficient networks there does not always exist a stable network that is efficient next we show that this tension persists generally to assure that there exists a stable network that is efficient one is forced to allocate resources to nodes that are not responsible for any of the production we characterize one such allocation rule the equal split rule and another rule that arises naturally from bargaining of the players

the cost of segregation in social networks abstract this paper investigates the welfare effect of income redistribution in the private provision of public goods on networks we first show that the welfare effect of income redistribution is determined by bonacich centrality then we develop an index based on the network structure of interactions which roughly speaking measures the welfare effect of income redistribution confined to a component of contributors the proposed index vanishes when applied to large components of contributors that display special segregated interactions which suggests an asymptotic neutrality of redistributive policies

on the private provision of public goods on networks abstract this paper analyzes the private provision of public goods where consumers interact within a fixed network structure and may benefit only from their direct neighbors provisions we present a proof of the existence and uniqueness of a nash equilibrium for general networks and best reply functions in addition we investigate the neutrality result of warr 38 and bergstrom blume and varian 6 whereby consumers are able to undo the impact of income redistribution as well as public provision financed by lump sum taxes to this effect we show that the neutrality result has a limited scope of application beyond a special network architecture in the neighborhood of the set of contributors

how to organize crime in criminal organizations diffusing information widely throughout the organization might lead to greater internal efficiency in particular since these organizations are self sustaining through enhancing trust however this may come at the cost of leaving the organization more vulnerable to external threats such as law enforcement we consider the implications of this trade off and characterize the optimal information structure rationalizing both hierarchical structures and organization in cells then we focus on the role of the external authority characterize optimal detection strategies and discuss the implications of different forms of enforcement on the internal structure of the organization and policy finally we discuss a number of applications and extensions in this paper we study the interplay between trust within an illegal organization and its vulnerability to the authorities illegal organizations function more effectively when the people who constitute them trust each other we argue that information sharing is an important factor in building internal trust and cohesion but that can leave the organization vulnerable understanding how this trade off affects an organization s information structure and productivity can allow us to assess detection policies designed to destabilize such organizations since 9 11 the u s congress has passed a 400 billion annual budget for the war on terror new domestic institutions have been created or enhanced among many others the counterterrorism section at the u s department of justice s criminal division international intelligence cooperation has been strengthened and new protocols and controversial legal tools such as the patriot act have been developed however these new agencies and institutions face the same basic questions that have challenged the prosecutors fighting organized crime in italy south america and eastern asia as well as authorities fighting terrorism all over the world now and in the past how can we learn about the internal structure of criminal organizations how should we go about investigating a criminal organization in order to break its internal cohesion how does a criminal organization react to investigation policies we highlight the fact that simply understanding the information links within an organization gives us insight into addressing these questions the anecdotal evidence suggests that there is a wide heterogeneity across the information structures of different criminal organizations the most credited theory about the mafia developed in the early 1990 s has identified the so called cupola as the highest level of the organization supposedly consisting of agents who hold large amounts of information about the organization itself and carry out the enforcement needed for the organization to function 2 these crucial agents are shielded from the authorities since they are typically not directly involved in criminal activities this theory suggests a centralized information and enforcement structure 1 previous drafts have circulated under the titles power and organizational structure under an external threat