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

indirect effects of an aid program how do cash transfers affect ineligibles consumption cash transfers to eligible households indirectly increase the consumption of ineligible households living in the same villages this effect operates through insurance and credit markets ineligible households benefit from the transfers by receiving more gifts and loans and by reducing their savings thus the transfers benefit the local economy at large looking only at the effect on the treated underestimates the impact one should analyze the effects of this class of programs on the entire local economy rather than on the treated only and use a village level randomization rather than selecting treatment and control subjects from the same community

group lending repayment incentives and social collateral abstract in this paper we investigate the impact on repayment rates of lending to groups which are made jointly liable for repayment this type of scheme especially in the guise of the grameen bank in bangladesh has received increasing attention we set up and analyze the repayment game which group lending gives rise to our analysis suggests that such schemes have both positive and negative effects on repayment rates the positive effect is that successful group members may have an incentive to repay the loans of group members whose projects have yielded insufficient return to make repayment worthwhile the negative effect arises when the whole group defaults even when some members would have repaid under individual lending we also show how group lending may harness social collateral which serves to mitigate its negative effect

a comparison of determinants of urban rural and farm poverty in costa rica abstract the lack of progress on reducing poverty in third world countries and its growth during the 1980s show that one of the fundamental goals of development has not been met addressing the renewed concern with poverty requires knowledge about the factors affecting poverty this paper uses logistic regression analysis to estimate the effects of variables on urban rural farm and nonfarm poverty among households in costa rica results show the complexity of the issue and imply policies to expand education through the secondary level to create more opportunities for rural off farm employ

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

the value of connections evidence from the italian american mafia using declassified federal bureau of narcotics records on 800 us mafia members active in the 1950s and 1960s and on their connections within the organized crime network i estimate network effects on gangsters economic status lacking information on criminal proceeds i measure economic status exploiting detailed information about their place of residence housing values are reconstructed using current deflated transactions recorded on zillow com i deal with the potential reverse causality between the economic status and the gangster s position in the network exploiting exogenous exposure to potential pre immigration connections in the absence of pre immigration data i use the informational content of surnames called isonomy to measure the place of origin the instrument is valid as long as conditional on the characteristics of the gangsters including the region of birth and a rich set of controls about the gangsters legal and illegal activities such exposure influences the gangsters importance inside the network called centrality but not the preference for specific housing needs a standard deviation increase in closeness centrality increases economic status by between one forth ols and one standard deviation 2sls

dynamic financial constraints distinguishing mechanism design from exogenously incomplete regimes we formulate and solve a range of dynamic models of constrained credit insurance that allow for moral hazard and limited commitment we compare them to full insurance and exogenously incomplete financial regimes autarky saving only borrowing and lending in a single asset we develop computational methods based on mechanism design linear programming and maximum likelihood to estimate compare and statistically test these alternative dynamic models with financial information constraints our methods can use both cross sectional and panel data and allow for measurement error and unobserved heterogeneity we estimate the models using data on thai households running small businesses from two separate samples we find that in the rural sample the exogenously incomplete saving only and borrowing regimes provide the best fit using data on consumption business assets investment and income family and other networks help consumption smoothing there as in a moral hazard constrained regime in contrast in urban areas we find mechanism design financial information regimes that are decidedly less constrained with the moral hazard model fitting best combined business and consumption data we perform numerous robustness checks in both the thai data and in monte carlo simulations and compare our maximum likelihood criterion with results from other metrics and data not used in the estimation a prototypical counterfactual policy evaluation exercise using the estimation results is also featured

mexico stabilization debt and growth mexico rudiger dornbusch mexico today is at a crossroads as the de la madrid presidency which has been dominated by the debt crisis comes to an end a number of major policy difficulties remain inflation is still a problem and the continuation of stagnation in a country where the population grows by 3 a year is clearly unsustainable the outlook for inflation is dependent on the government s ability to keep its budget under control the stabilization programme has been quite successful in this respect but the cost in terms of foregone growth is staggering the issue here is how to collect the disinflation benefits of policy restraint analysing the peculiar process of rapid inflation both in mexico and elsewhere the author calls for an incomes policy as for growth it is closely linked to the external situation mexico which triggered the debt crisis in 1982 has made remarkable progress in achieving a non interest current account surplus yet its external debt remains huge and requires a continuation of net transfers abroad the experience though is that debt service comes at the expense of productive investment and growth the author proposes to escape from the unacceptable choice between debt service and growth by adopting what he calls interest rescheduling a debt equity swap applied to interest payments rather than to the principal

risk and insurance in a rural credit market an empirical investigation in northern nigeria credit contracts play a direct role in pooling risk between households in northern nigeria repayments owed by borrowers depend on realizations of random shocks by both borrowers and lenders the paper develops two models of state contingent loans the first is a competitive equilibrium in perfectly enforceable contracts the second permits imperfect information and equilibrium default estimates of both models indicate that quantitatively important state contingent payments are embedded in these loan transactions but that a fully efficient risk pooling equilibrium is not achieved the research is based on a year long survey in zaria nigeria conducted by the author

microcredit and adjustment to environmental shock evidence from the great famine in ireland the great famine of ireland from 1845 to 51 ranks as one of the most lethal of all time claiming approximately one eighth of the country s population utilizing famine relief commission reports to develop a micro level dataset of blight severity i find that in the short run districts more severely infected by blight experienced larger population declines and accumulations of buffer livestock by small to medium sized farms in the medium and long runs however worse affected districts experienced greater substitutions toward other tillage crops and grazing livestock particularly by small to medium sized farms using annual reports of the irish loan funds i further find that access to microfinance credit was an important factor in non demographic adjustment to blight worse affected districts with at least one microfinance fund during the famine experienced substantially smaller relative population declines and larger relative increases in buffer livestock during and immediately after the famine and greater relative medium and long run substitutions toward other crops and grazing livestock than worse affected districts without a fund

economic crisis adjustment and living standards in mexico 1982 85 abstract this paper presents an estimate of the impact of economic crisis and adjustment on the living standards of the mexican population between 1982 and 1985 the analysis is based on information on wage and nonwage incomes unemployment functional income distribution changes in public expenditures and social indicators the specific questions addressed are what happened to agricultural and nonagricultural wage and nonwage incomes how did unemployment and the composition of employment change what was the impact of fiscal cuts on social expenditures and food subsidies were social services affected by declining resources did social indicators worsen in addition households strategies in response to declining incomes are briefly discussed finally conjectures are made regarding which population groups were hurt most by the crisis the results indicate that the crisis and adjustment process left mexico with a relatively impoverished middle class and with rising poverty

the economic lives of the poor in what turned out to be a rhetorical master move the 1990 world development report from the world bank defined the extremely poor people of the world as those who are currently living on no more than 1 per day per person measured at the 1985 purchasing power parity ppp exchange rate in 1993 the poverty line was updated to 1 08 per person per day at the 1993 ppp exchange rate which is the line we use in this paper poverty lines have always existed indeed 1 per day was chosen in part because of its proximity to the poverty lines used by many poor countries 1 however the 1 a day poverty line has come to dominate the conversations about poverty to a remarkable extent

jeea fbbva lecture 2019 consumption insurance in networks with asymmetric information evidence from tanzania this paper uses a dataset from tanzania with information on consumption income and income shocks within and across family networks crucially and uniquely it also contains data on the degree of information existing between each pair of households within family networks we use these data to construct a novel measure of the quality of information both at the level of household pairs and at the level of the network we also note that the individual level measures can be interpreted as measures of network centrality we study risk sharing within these networks and explore whether the rejection of perfect risk sharing that we observe can be related to our measures of information quality we show that households within family networks with better information are less vulnerable to idiosyncratic shocks furthermore we show that more central households within networks are less vulnerable to idiosyncratic shocks these results have important implications for the characterisation of the empirical failure of the perfect risk sharing hypothesis and point to the importance of information frictions

evaluation of financial liberalization a general equilibrium model with constrained occupation choice the objective of this paper is to assess both the aggregate growth effects and the distributional consequences of financial liberalization as observed in thailand from 1976 to 1996 a general equilibrium occupational choice model with two sectors one without intermediation and the other with borrowing and lending is taken to thai data key parameters of the production technology and the distribution of entrepreneurial talent are estimated by maximizing the likelihood of transition into business given initial wealth as observed in two distinct datasets other parameters of the model are calibrated to try to match the two decades of growth as well as observed changes in inequality labor share savings and the number of entrepreneurs without an expansion in the size of the intermediated sector thailand would have evolved very differently namely with a drastically lower growth rate high residual subsistence sector non increasing wages but lower inequality the financial liberalization brings welfare gains and losses to different subsets of the population primary winners are talented would be entrepreneurs who lack credit and cannot otherwise go into business or invest little capital mean gains for these winners range from 17 to 34 percent of observed overall average household income but liberalization also induces greater demand by entrepreneurs for workers resulting in increases in the wage and lower profits of relatively rich entrepreneurs of the same order of magnitude as the observed overall average income of firm owners foreign capital has no significant impact on growth or the distribution of observed income

below the line poverty in latin america abstract despite gains in basic welfare indicators poverty remains prevalent in latin america this paper surveys existing data on poverty in the region and discusses the relationship between growth inequality and poverty given the inequality of income distribution in latin america and the slow growth of output policies to overcome poverty must involve more efficient allocation of government resources redistribution and foreign aid

saving and liquidity constraints this paper is concerned with the theory of saving when consumers are not permitted to borrow and with the ability of such a theory to account for some of the stylized facts of saving behavior the models presented in the paper seem to account for important aspects of reality that are not explained by traditional life cycle models copyright 1991 by the econometric society

social networks and factor markets panel data evidence from ethiopia we investigate the role of an indigenous social network in ethiopia the iddir in facilitating factor market transactions among smallholder farmers we use detailed longitudinal household survey data and employ fixed effects estimation approaches to identify the effect of iddir membership on factor market transactions among farmers we find that joining an iddir network improves households access to land labour and credit transactions our findings also hint that iddir networks may crowd out borrowing from local moneylenders locally referred as arata abedari a relatively expensive credit source these results suggest that non market institutions can play crucial roles in facilitating market transactions

income smoothing and consumption smoothing one way that risk averse households protect consumption levels is to borrow and use insurance mechanisms another way common in low income economies is to diversify economic activities and make conservative production and employment choices households thus tend toward limiting exposure only to shocks that can be handled with available credit and insurance typically both types of mechanisms are studied independently but much more can be learned by studying them together first we obtain a more complete picture of risks costs and insurance possibilities second it opens the way to considering biases in standard tests of credit and insurance

financial systems in northern thai villages field research attempted to measure the risky environments the information structures the institutions and the risk response mechanisms of ten villages in northern thailand various key features are then modeled in an abstract but realistic way either with a full information risk sharing model or an information constrained version of the same model observations from some of the villages seem consistent with one or the other of these models but in many of the villages one is left with risk response variations across households which suggest that pareto improvements are possible

kinship and financial networks formal financial access and risk reduction kinship networks are beneficial for smoothing consumption and investment but the channels are not well understood we study the financing devices used for consumption and investment by thai households households that are connected to banks achieve significantly better consumption smoothing than unconnected households indirect connections via inter household borrowing are as effective as direct borrowing investment appears to be facilitated by kinship households with kin in the village display reduced sensitivity of investment to income while connections to banks do not significantly reduce sensitivity kin may act as implicit collateral permitting borrowing that would violate repayment constraints in its absence

from tradition to modernity economic growth in a small world this paper introduces the small world model watts and strogatz nature 1998 into the theory of economic growth and investigates how increasing economic inte gration aects rm size and eciency norm enforcement and aggregate economic perfor mance when economic integration is low and local connectivity is high informal norms control entrepreneurial behavior and more integration mainly improves search for ecient investment opportunities at a higher level of economic integration neighborhood enforce ment deteriorates and formal institutions are needed to keep entrepreneurs in check a gradual take o to perpetual growth is explained by a feedback eect

negotiating comfort in low energy housing the politics of intermediation optimising the energy performance of buildings is technically and economically challenging but it also has significant social implications maintaining comfortable indoor conditions while reducing energy consumption involves careful design construction and management of the built environment and its inhabitants in this paper we present findings from the study of a new low energy building for older people in grenoble france where conflicts emerged over the simultaneous pursuit of energy efficiency and comfort the findings contribute to the contemporary literature on the sociotechnical study of buildings and energy use by focusing on intermediation those activities that associate a technology to end users intermediation activities take many forms and in some cases can result in the harmonisation or alignment of energy efficiency goals and comfort goals in other cases intermediation is unsuccessful leading to the conventional dichotomy between optimising technical performance and meeting occupant preferences by highlighting the multiple ways that comfort and energy efficiency is negotiated we conclude that buildings are provisional achievements that are constantly being intermediated this suggests that building energy efficiency policies and programmes need to provide opportunities for intermediaries to negotiate the desires and preferences of the multiple stakeholders that are implicated in low energy buildings

using repayment data to test across models of joint liability lending theories rationalising joint liability lending are rich in implications for repayment rates we exploit this fact to test four diverse models we show that the models repayment implications do not always coincide for example higher correlation of output and borrowers ability to act cooperatively can raise or lower repayment depending on the model data from thai borrowing groups suggest that repayment is affected negatively by the joint liability rate ceteris paribus and social ties and positively by the strength of local sanctions and correlated returns further the relative fit of the adverse selection versus informal sanctions models varies by region

coal fires fresh air and the hardy british a historical view of domestic energy efficiency and thermal comfort in britain fuel poverty has been most commonly researched in the uk although it is experienced in other parts of europe to varying degrees boardman 1991 showed that energy inefficient buildings and heating systems are the most significant components of fuel poverty and highlighted the legacy of older buildings in this country that remain the majority of those now recognised as hard to treat this paper considers the historical context for fuel poverty as a particularly british phenomenon it examines claims that this is due to the mild climate and low indoor temperature expectations it is concluded that there are significant differences from the european situation the climate particularly its characteristic changeability has influenced building and heating methods and the low priority given to energy efficiency by legislators significantly economic priorities produced poor quality mass housing during the industrial revolution the availability of coal encouraged the use of open fires which demanded high ventilation rates the british do value warmth but older buildings designed for heating with radiant open fires are difficult to adapt to convective central heating lessons can be drawn for newly industrialised economies similarly producing poor quality mass housing with low priorities for energy efficiency

the role of social capital in financial development to identify the effect of social capital on financial development we exploit social capital differences within italy in high social capital areas households are more likely to use checks invest less in cash and more in stock have higher access to institutional credit and make less use of informal credit the effect of social capital is stronger where legal enforcement is weaker and among less educated people these results are not driven by omitted environmental variables since we show that the behavior of movers is still affected by the level of social capital of the province where they were born

village and larger economies the theory and measurement of the townsend thai project i have spent close to 20 years cataloging transactions between households in thai villages along with a research team just this past summer we documented a number of ways in which even relatively poor villages have money markets not dissimilar in some ways from new york financial markets with borrowing and repayment passing along links in credit chains in another project we have been looking at month by month school attendance grade level completion and graduation for children in these villages following them from birth to graduation the townsend thai project is a theory based data collection endeavor measuring and mapping village and larger economies into general equilibrium frameworks this paper reviews a number of findings implications applications and lessons learned and considers next steps

thy neighbor s keeper the design of a credit cooperative with theory and a test economists now appreciate that resource allocation in less economically developed economies is profoundly influenced by non firm economic institutions however our theories of non firm institutions often suggest different answers to many questions including those of policy this paper illustrates a method for discriminating between alternative theories using data from german credit cooperatives from the nineteenth and early twentieth century germany we build a model of credit cooperatives designed to provide monitoring incentives and test this using nineteenth century data authors

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

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

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

policies and impact an analysis of village level microfinance institutions this paper uses variation in policies and institutional characteristics to evaluate the impacts of village level microfinance institutions in rural thailand to identify impacts we use policies related to the successful unsuccessful provision of services as exogenous variation in effective financial intermediation we find that institutions particularly those with good policies can promote asset growth consumption smoothing and occupational mobility and can decrease moneylender reliance specifically cash lending institutions production credit groups and especially women s groups are successful in providing intermediation and its benefits to members while buffalo banks and rice banks are not the policies identified as important to intermediation and benefits the provision of savings services especially pledged savings accounts emergency services and training and advice surprisingly much publicized policies such as joint liability default consequences or repayment frequency had no measured impacts jel 012 016

accounting for the poor economists and other social scientists have long tried to understand the nature of poverty and how poor people make decisions for example t w schultz a nobel laureate former professor of economics at the university of chicago and former president of the american economic association spent his career working in development and agricultural economics in his 1980 nobel prize acceptance speech schultz suggests that there is some accounting for the behavior of the poor in agriculture farmers the world over in dealing with costs returns and risks are calculating economic agents within their small individual allocative domain they are fine tuning entrepreneurs tuning so subtly that many experts fail to recognize how efficient they are schultz 1980

consumption and investment in resource pooling family networks this paper examines a novel motive for resource pooling in family networks in rural economies to relax credit constraints and facilitate investment in non collateralizeable assets for which credit market imperfections are most binding we thus complement established literatures examining risk sharing motives for resource transfers within family networks as well as motives based on kinship tax obligations we do so exploiting the progresa program data in which family networks can be identified households are subject to large exogenous resource inflows and detailed responses on consumption and an array of investments can be tracked in a household panel over five years we find that for every dollar that accrues to the family network through progresa transfers food consumption expenditures increase by around 65c for both households eligible for progresa and ineligible members of the same family network hence the marginal propensity of families to invest save out of every dollar is around 35 and we document how this is channelled towards easing credit constraints poorer network members face in financing non collateralizable investments into their children s human capital we show these consumption and investment benefits of being embedded within a family network are sustained five years after households first experience resource transfers from progresa hence the interplay between resource inflows and resource pooling by family networks can place network members on sustained paths out of poverty this article is protected by copyright all rights reserved

credit availability and internal migration evidence from thailand this study investigates the relationship between borrowing and internal migration exploiting the micro finance scheme village fund in thailand it investigates the short and medium term effects o

the challenge to uk energy policy an ageing population perspective on energy saving measures and consumption abstract with a focus on the residential sector this paper explores the likelihood of the uk government meeting its energy targets the paper contends that energy policy needs to take into account the interplay of four major factors an ageing population of increasing diversity a cultural inclination for older housing much of which is thermally inefficient levels of fuel poverty and the inexorable rise of consumer spending on leisure related services and goods decisions made by older households both the poorer and the better off may be critical to the success of energy policy among the better off the changing expectations of the baby boomers with their predilection for consumption and travel may have particular impact the paper concludes that much of the reduction in carbon footprint made by older people s choices in heating and insulation may be offset not only by increasing domestic thermal comfort but also potentially by increasing consumables in the home and other consumer lifestyle choices what could be achieved at best may be a shift in energy mix

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

the life cycle of a microfinance institution the irish loan funds abstract ireland s loan funds were a long lived self sustaining large scale microfinance organization that made millions of loans without collateral to the poor during the first 100 years of their life cycle a period of growth ending in the 1840s they adapted constantly and obtained improvements to their legal structure because they were complementary to the banking system and seen as effective in relieving poverty in their 2nd century they became ossified in part because of competition with commercial banks the loan funds provide an example of sustainable microfinance under harsh economic conditions and illustrate how organizations change incrementally and when successful alter their institutional framework

networks in the modern economy mexican migrants in the u s labor market this paper attempts to identify job networks among mexican migrants in the u s labor market the empirical analysis uses data on migration patterns and labor market outcomes based on a sample of individuals belonging to multiple origin communities in mexico over a long period of time each community s network is measured by the proportion of the sampled individuals who are located at the destination the united states in any year we verify that the same individual is more likely to be employed and to hold a higher paying nonagricultural job when his network is exogenously larger by including individual fixed effects in the employment and occupation regressions and by using rainfall in the origin community as an instrument for the size of the network at the destination

on repeated moral hazard with discounting in this paper we analyze optimal contracts in an infinitely repeated agency model in which both the principal and agent discount the future we show that there is a stationary representation of the optimal contract when the agent s conditional discounted expected utility is used as a state variable this representation reduces the multi period problem to a static variational problem which can be analyzed using standard variational techniques this reduction is used to obtain several properties of the contract

do rural banks matter evidence from the indian social banking experiment lack of access to finance is often cited as a key reason why poor people remain poor this paper uses data on the indian rural branch expansion program to provide empirial evidence on this issue between 1977 and 1990 the indian central bank mandated that a commercial bank can open a branch in a location with one or more bank branches only if it opens four in locations with no bank branches we show that between 1977 and 1990 this rule caused banks to open relatively more rural branches in indian states with lower initial financial development the reverse is true outside this period we exploit this fact to identify the impact of opening a rural bank on poverty and output our estimates suggest that the indian rural branch expansion program significantly lowered rural poverty and increased non agricultural output

the impact of kinship networks on the adoption of risk mitigating strategies in ethiopia the adoption of certain farm management practices such as tree planting and soil and water conservation can reduce exposure to weather shocks however in many countries the adoption of such risk mitigating measures is far from complete we explore how risk sharing networks in the form of kinship characterized by the moral imperative of within group sharing affects the adoption of risk mitigating activities in rural ethiopia we find suggestive evidence that compulsory sharing invites free riding and attenuates incentives for self protection against weather shocks we also find evidence of the existence of a possible substitution effect between credit and social networks

risk sharing and transactions costs evidence from kenya s mobile money revolution we explore the impact of reduced transaction costs on risk sharing by estimating the effects of a mobile money innovation on consumption in our panel sample adoption of the innovation increased from 43 to 70 percent we find that while shocks reduce consumption by 7 percent for nonusers the consumption of user households is unaffected the mechanisms underlying these consumption effects are increases in remittances received and the diversity of senders we report robustness checks supporting these results and use the four fold expansion of the mobile money agent network as a source of exogenous variation in access to the innovation jel e42 g22 o16 o17 z13 in developing countries informal networks provide an important means by which individuals and households share risk though the insurance they provide is often incomplete economists have proposed a number of reasons for this incompleteness including information asymmetries which manifest in problems of moral hazard and limited commitment both of which induce positive correlations between realized income and consumption in this article we emphasize a complementary source of incompleteness transaction costs literally the costs of transferring resources between individuals we test the impact of transaction costs on risk sharing by analyzing data from a large panel household survey that we designed and administered in kenya over a three year period to capture the expansion of mobile money this financial innovation has allowed individuals to transfer purchasing power by simple short messaging service sms technology and has dramatically reduced the cost of sending money across large distances mobile money is a recent innovation in developing economies one of the first and most successful examples to date is kenya s m pesa 1 in just four years after its