competition and microfinance abstract competition between microfinance institutions mfis in developing countries has increased dramatically in the last decade we model the behavior of non profit lenders and show that their non standard client maximizing objectives cause them to cross subsidize within their pool of borrowers thus when competition eliminates rents on profitable borrowers it is likely to yield a new equilibrium in which poor borrowers are worse off as competition exacerbates asymmetric information problems over borrower indebtedness the most impatient borrowers begin to obtain multiple loans creating a negative externality that leads to less favorable equilibrium loan contracts for all borrowers

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

the supply and demand side impacts of credit market information abstract we utilize a unique pair of experiments to isolate the ways in which reductions in asymmetric information alter credit market outcomes a guatemalan microfinance lender gradually started using a credit bureau across its branches without letting borrowers know about it one year later we ran a large randomized credit information course that described the existence and workings of the bureau to the clients of this lender this pairing of natural and randomized experiments allows us to separately identify how new information enters on the supply and the demand sides of the market our results indicate that the credit bureau generated large efficiency gains for the lender and that these gains were augmented when borrowers understood the rules of the game the credit bureau rewarded good borrowers but penalized weaker ones increasing economic differentiation

a financial portfolio approach to inventory behaviour japan and the uk abstract the paper analyses the determinants of the inventory to assets ratio in panel data sets of japanese and uk firms in the period 1960 1985 the analytical framework sets inventory decisions in the context of decisions by the firm about other assets and liabilities in contrast to traditional models of inventories investment in inventories in japan is found to be particularly related to sector specific inflation rates and expected sales negatively to expected profits and not much affected by interest rates by contrast uk inventories are generally positively related to profit rates and respond to short term interest rates once other variables are taken into account the coefficient on a time trend is positive for japan negative for britain which casts some doubt on the widely held view of japanese innovation in inventory holding

annual versus lifetime income redistribution by social security abstract in this study we compare the redistributive impact of the dutch social security on an annual basis with the lifetime redistributive impact the analysis confirms the theoretical notion that the lifetime impact is smaller than the annual incidence studies suggest this holds especially for old age pensions and social assistance and to a lesser extent the disability state pension we also find that for the netherlands the younger the cohort is the larger the difference however employee insurances do not necessarily imply a smaller redistributive impact on a lifetime basis the results are of course affected by the discount rate used and the assumptions with respect to economic growth the discount rate generally appears to be negatively correlated with the redistributive impact whereas the effect of growth is less straightforward

market structure and borrower welfare in microfinance motivated by recent controversies surrounding the role of commercial lenders in microfinance we analyze borrower welfare under different market structures considering a benevolent non profit lender a for profit monopolist and a competitive credit market to understand the magnitude of the effects analyzed we simulate the model with parameters estimated from the mix market database our results suggest that market power can have severe implications for borrower welfare while despite possible information frictions competition typically delivers similar borrower welfare to non profit lending in addition for profit lenders are less likely to use joint liability than non profits

the macroeconomic implications of a resource discovery in an open economy this paper analyses the macroeconomic impact on an economy of the discovery of significant quantities of a natural resource the resource will be termed oil and the analysis is intended to be suggestive of the effects on the u k economy of the discovery of north sea oil and of possible policy responses our motivation is what appears to be an inconsistency between the commonly expressed view that north sea oil has generated unemployment by causing the exchange rate to appreciate2 and the contention of proponents of the new classical macroeconomics that the oil discovery creates no special macroeconomic problems 3 in order to abstract from microeconomic questions we shall assume that oil is perfectly tradable and that there are no extraction costs 4 we also assume that the foreign currency oil price is exogenous and rises at the foreign interest rate the effect of these assumptions is that for the economy as a whole the oil discovery can be considered as a foreign exchange windfall of fixed magnitude and we define the term oil revenue in a permanent income sense as the infinite term foreign exchange annuity value of this windfall oil revenue as defined is independent of depletion policy it accrues whether or not depletion is occurring at any date since it includes capital gains on the oil stock and depends in no way on whether the oil is exported or used domestically it will be assumed throughout that the economy operates with a flexible exchange rate and that international capital mobility is perfect at the date of discovery the economy is assumed to be at zero inflation full employment with both current and capital accounts balanced we are primarily interested in the dynamics of adjustment to the oil discovery but comparative static analysis5 provides a convenient point of departure for this purpose only we suppose that depletion is managed so as actually to realise the oil revenue each year if all the oil revenue is saved then there are no effects on demand prices or

bargaining power and enforcement in credit markets abstract in a credit market with enforcement constraints we study the effects of a change in the outside options of a potential defaulter on the terms of the credit contract as well as on borrower payoffs the results crucially depend on the allocation of bargaining power between the borrower and the lender we prove that there is a crucial threshold of relative weights such that if the borrower has power that exceeds this threshold her expected utility must go up whenever her outside options come down but if the borrower has less power than this threshold her expected payoff must come down with her outside options in the former case a deterioration in outside options brought about say by better enforcement must create a lorenz improvement in state contingent consumption in particular borrower consumption rises in all bad states in which loans are taken in the latter case in contrast the borrower s consumption must decline at least for all the bad states these disparate findings within a single model permit us to interpret existing literature on credit markets in a unified way

testing a discrete switching disequilibrium model of the uk labour market this paper develops a test procedure for serial correlation for discrete switching disequilibrium models which include both an endogenous price adjustment equation and lagged dependent variables the tests are applied to a model of the u k labor market and the model is respecified in the light of the test results

optimal anti inflation programs in semi industrialized economies orthodox versus heterodox policies abstract the paper characterizes the optimal time consistent anti inflation program in a small open semi industrialized economy when policy makers choose the rate of exchange rate crawl the rate of change of fiscal spending and a wage and price control parameter to minimize deviations of output and inflation the optimal program involves a rapidly decelerating rate of crawl a sharp reduction in spending and a short initial period of wage and price controls the paper also assesses the importance of controls in helping to reduce the output loss associated with fighting inflation

is grameen lending efficient repayment incentives and insurance in village economies many believe that a key innovation by the grameen bank is to encourage borrowers to help each other in hard times to analyse this we study a mechanism design problem where borrowers share information about each other but their limited side contracting ability prevents them from writing complete insurance contracts we derive a lending mechanism which efficiently induces mutual insurance it is necessary for borrowers to submit reports about each other to achieve efficiency such cross reporting increases the bargaining power of unsuccessful borrowers and is robust to collusion against the bank copyright 2004 wiley blackwell

input and output inventories in the uk what is the role of inventories in uk manufacturing we present and estimate a model of inventories that considers separately finished goods and input i e the sum of raw materials and work in process inventories our results suggest that both types of inventories are used for production level and production cost smoothing we identify a small but significant negative relationship between inventories and the real interest rate thus providing support for one of the textbook channels of the monetary policy transmission mechanism variance decompositions indicate that technology shocks are the dominant driving factor behind cyclical changes in inventories

commercialization and the decline of joint liability microcredit abstract numerous authors point to a decline in joint liability microcredit and rise in individual liability lending but empirical evidence is lacking and there have been no rigorous analyses of possible causes we first show using the well known mix market dataset that there is evidence for a decline second we show theoretically that commercialization an increase in competition and a shift from non profit to for profit lending both of which are present in the data drives lenders to reduce their use of joint liability loan contracts third we test the model s key predictions and find support for them in the data

the redistributive impact of the general old age pensions act on lifetime income in the netherlands by means of a simple simulation model we will look at the effect of the general old age pensions act on the distribution of lifetime income in the netherlands in spite of the fact that premiums are proportional to income whereas benefits are only dependent on marital status married or unmarried 1 the redistribution of income is rather limited this is especially true for the vertical income redistribution within a generation this is caused by differences in mortality rates and differences in the duration of working life between income groups

the effect of social capital on group loan repayment evidence from field experiments an important question to microfinance is the relevance of existing social capital in target communities to the performance of group lending this research presents evidence from field experiments in south africa and armenia in which subjects participate in trust and microfinance games we present evidence that personal trust between group members and social homogeneity are more important to group loan repayment than general societal trust or acquaintanceship between members we also find some evidence of reciprocity those who have been helped by other group members in the past are more likely to contribute in the future during the past decade exploring the role that social capital plays in economic behaviour has emerged as one of the most fascinating and fertile areas of economic research although precise definitions of social capital are notoriously difficult to pin down one of the early pioneers of the concept coleman 1988 defines social capital as social structure that facilitates certain actions of actors within the structure in his definition coleman specifically highlights the roles of mutual obligation expectations and trustworthiness social norms social sanctions and the transmission of information important studies in both developed and developing countries have analysed the impact of social capital in economic relationships putnam s celebrated work making democracy work civic traditions in modern italy 1993 and bowling alone america s declining social capital 1995 brought attention to the role that social capital plays in the development of the modern state udry s ground breaking 1994 work in nigeria illustrated how the social capital existing in traditional societies may allow for more efficient credit contracts than in developed economies with weaker social

the effects of differential income replacement and mortality on u s social security redistribution we study redistribution via the u s social security retirement system for cohorts of men born during the second half of the 20th century our focus is on redistribution across race and education groups the cohorts we study are younger than cohorts studied in previous similar research and thus more exposed to recent increases in earnings inequality all else equal this should increase the degree of progressivity of social security redistribution due to the structure of the benefit formula however we find that redistribution is only modestly progressive for individuals born as late as 1980 differential mortality rates across race and education groups are the primary explanation while black white mortality gaps have narrowed some in recent years they remain large and dull progressivity mortality gaps by education level are also large and unlike the gaps by race they are widening which puts additional regressive pressure on social security redistribution

inventories and asymmetric business cycle fluctuations in the uk a structural approach this paper investigates the movement of manufacturing inventories and production over the business cycle to arrive at an asymmetric structural equilibrium correction model initially cross correlation coefficients and deepness and steepness tests for skewness are utilized to present descriptive statistics of the time series cointegration analysis is performed on each disaggregate inventory by stage of production finished goods work in progress and raw materials with a set of explantory variables restricted cointegration vectors are added to the symmetric and non symmetric specifications of the structural equilibrium correction model these are compared by parameter constancy tests and one step ahead forecasts

the determinants of manufacturing inventories in the uk the authors examine the determinants of inventory holding by the u k manufacturing sector over the period 1968 89 they find that inventory levels respond positively to output and its conditional variance and negatively to the level of gearing tehnological innovation in the form of computerized inventory control leads to a fall in the stock output ratio epirical results for inventories are examined in a cointegration and a general to specific error correction model with conditional variances estimated using an arch framework a backward looking error correction model is found to outperform a forward looking model although the latter also provides a reasonable fit to the data copyright 1993 by royal economic society

macroeconomic policy design and control theory a failed partnership my subject is the applicability of control theory to the pressing questions of macroeconomic policy design that face us both domestically and in the international arena i approach the issue with some trepidation conscious that i am a relative amateur in control matters i am also mindful of the dangers of claiming too much in the field of policy design those were nicely stated in a broader context by that eminent biologist sir peter medawar i984 when he wrote

taxation pension and saving in a small open economy an overlapping generations model of a small open economy is used to explore several policy options aimed at reducing the burden of income taxes and pay as you go payg contributions on labor income so as to improve the incentives to supply labor including the return of funded collective fc pension plans in the tax base turns out to be counterproductive cutting payg benefits in contrast succeeds in improving efficiency in general and labor market incentives in particular under specific variants of the fc plan reducing payg benefits even proves to be pareto welfare improving

not for profit entrepreneurs abstract entrepreneurs who start new firms may choose not for profit status as a means of committing to soft incentives such incentives protect donors volunteers consumers and employees from ex post expropriation of profits by the entrepreneur we derive conditions under which completely self interested entrepreneurs opt for not for profit status despite the fact that this status limits their ability to enjoy the profits of their enterprises we also show that even in the absence of tax advantages unrestricted donations would flow to non profits rather than for profit firms because donations have more significant influence on the decisions of the non profits

economic consequences of an aging population pip europe and japan are experiencing the aging of their populations aging implies a restructuring of the economy political issues which arise in an aging society include 1 a voting majority for the interests of the elderly 2 a voting majority of females 3 the domination of the decision power in corporate and similar ruling bodies and 4 unemployment or a long wait for promotion for younger people economic issues of an aging society include 1 population aging often occurs under reduced rates of growth of per capita national income 2 the relative economic status of the elderly very much depends on the currently existing tax transfer systems and 3 the income of families whose head is over age 65 has generally been more unequally distributed than the income for younger families issues concerning the labor supply of the elderly include 1 the availability of pension income and health limitations strongly influence decisions to retire and 2 older workers become disheartened and choose early retirement when facing bad reemployment prospects in general population aging is likely to have its most substantive effect on the overall level of productivity in an economy where technical knowledge is changing rapidly and strong competition necessitates a high degree of adaptability of the labor force

group lending without joint liability this paper contrasts individual liability lending with and without groups to joint liability lending we are motivated by an apparent shift away from the use of joint liability by microfinance institutions combined with recent evidence that a converting joint liability groups to individual liability groups did not affect repayment rates and b an intervention that increased social capital in individual liability borrowing groups led to improved repayment performance first we show that individual lending with or without groups may constitute a welfare improvement over joint liability so long as borrowers have sufficient social capital to sustain mutual insurance second we explore how the lender s lower transaction costs in group lending can encourage insurance by reducing the amount borrowers have to pay to bail one another out third we discuss how group meetings might encourage insurance either by increasing the incentive to invest in social capital or because the time spent in meetings can facilitate setting up insurance arrangements finally we perform a simple simulation exercise evaluating quantitatively the welfare impacts of alternative forms of lending and how they relate to social capital

macroeconomics and a bit more reality macroeconomics in its widest sense is a topic which is too diverse to be usefully discussed in a single article i will therefore take a very narrow view of what might be included under this general title and focus my attention on my own main area of interest the development and use of large macro econometric models this is an area which has a long tradition and literature stemming form the pioneering work of tinbergen i937 and the cowles commission klein i950 an extensive survey of the development of modelling may be found in bodkin klein and marwah i99i macroeconometric modelling grew rapidly in importance during the late i950s and the i960s going on to achieve a very influential role inmacroeconomic policy making during the i970s its failure to deliver the detailed economic control which it had seemed to promise then led to a barrage of attacks ranging from disillusion and sceptiscism on the part of policy makers to detailed and well argued acadeinic criticism of the basic methodology of the approach perhaps the most powerful and influential of these academic arguments came from sims i980 in his article macroeconomics and reality sims argued on three quite separate grounds against the basic process of model identification which lies at the heart of the cowles commission methodology firstly that economic theory gives rise to identification restrictions which are typically more complex than those traditionally applied in macroeconometric models in particular he said that theory normally implies complex cross equation restrictions which require system estimation and which cannot be imposed on a single equation basis secondly that traditional identification conditions are often met simply because of the presence of dynamics in the models sims argued that this identification is spurious and technically invalid as purely dynamic terms cannot help in structural identification in the conventional sense finally he said that the importance of expectations effects and the interaction of policy regimes and agents expectations make identification very difficult sims argued that any one of these problems would form a challenging but feasible research agenda but that doing all of these at once would be a programme which is so challenging as to be impossible in the short run he then proposed a methodology based on vector auto regressive var models

incentives and the de soto effect this paper explores the consequences of improving property rights to facilitate the use of fixed assets as collateral popularly attributed to the influential policy advocate hernando de soto we use an equilibrium model of a credit market with moral hazard to characterize the theoretical effects and also develop a quantitative analysis using data from sri lanka we show that the effects are likely to be nonlinear and heterogeneous by wealth group they also depend on the extent of competition between lenders there can be significant increases in profits and reductions in interest rates when credit markets are competitive however since these are due to reductions in moral hazard that is increased effort the welfare gains tend to be modest when cost of effort is taken into account allowing for an extensive margin where borrowers gain access to the credit market can make these effects larger depending on the underlying wealth distribution

welfare effects of unfunded pension systems when labor supply is endogenous abstract a mandatory unfunded pension system can lead to welfare losses if the contributions are levied in such a way that the labor supply decision of the individuals is distorted this is shown in an overlapping generations model for a closed economy furthermore it is shown that under certain conditions a gradual abolition of unfuded pensions using lump sum contributions in the transition phase can lead to an intergenerational pareto improvement thus the paper extends a result recently derived by homburg for a small open economy to the closed economy case

public pensions choices for the future abstract the purpose of this paper is to analyze to what extent pay as you go government mandated pensions can provide adequate retirement income to future generations this question is particularly relevant at times when the financial viability of public pensions is threatened by demographic aging and possibly declining productivity and when more importantly there is little consensus as to why those programs exist as they are that is mandatory public and unfunded the gist of our argument is that an aging population particularly if combined with declining productivity would jeopardize the financial and political viability of public pensions if individuals behavior doesn t adjust to this new reality and public authorities don t adopt the appropriate reforms as to mandatory retirement age payroll taxes and benefits structure among key individual decisions we focus on saving labor participation retirement education migration and fertility we consider how sensitive each of these is to changes in the environment and to changes in policy parameters then we turn to a number of issues unsolved either because of analytical complexity or because they arise from new realities

policy reforms and growth in computable olg economies we build a computable general equilibrium model with overlapping generations of agents and an endogenous growth specification a la lucas two main issues are addressed i to what extent does endogenous growth play a significant role in the face of policy reforms and ii are the simulation results robust to various calibrations of the production function of human capital in this purpose we simulate four large policy changes and compare the predictions with endogenous growth under various parameter sets to those with exogenous growth if endogenous growth is important when examining the effects of education reform it does not really matter with pension reforms and plays a minor role in the debt repayment scenario these results are very robust to calibration

manufacturing stocks and forward looking expectations in the uk this paper derives a model of the stocks plan based on optimal behavior by the firm when facing adjustment costs with forward looking expectations formation estimates of the model are reported for manufacturing using three alternative expectations mechanisms for determining expected sales time series published forecasts derived from national institute published forecasts and rational expectations the latter uses a submodel dependent on weakly exogenous variables single equation and whole model comparisons are made of the stocks equation estimated with forward expectations versus a traditional backward looking model these favor the forward looking model copyright 1986 by the review of economic studies limited

the return to capital in ghana we show that the real return to capital in ghana s informal sector is high for farmers we find annual returns ranging from 205 350 in the new technology of pineapple cultivation and 30 50 in well established food crop cultivation we also examine the relative prices of durable goods of varying durability and estimate a lower bound to the opportunity cost of capital of 60 this abstract was borrowed from another version of this item

robust control of forward looking models abstract this paper shows how to formulate and compute robust ramsey aka stackelberg plans for linear models with forward looking private agents the leader and the followers share a common approximating model and both have preferences for robust decision rules because both doubt the model since their preferences differ the leader s and followers decision rules are fragile to different misspecifications of the approximating model we define a stackelberg equilibrium with robust decision makers in which the leader and follower have different worst case models despite sharing a common approximating model to compute a stackelberg equilibrium we formulate a bellman equation that is associated with an artificial single agent robust control problem the artificial bellman equation contains a description of implementability constraints that include euler equations that describe the worst case analysis of the followers as an example the paper analyzes a model of a monopoly facing a competitive fringe

the second dividend and the demographic structure the demographic structure of a country influences economic activity the second dividend modifies growth accordingly in general equilibrium the second dividend and the demographic structure are interrelated this paper aims at assessing empirically the second dividend in a dynamic empirical and intertemporal setting that allows for measuring its impact on growth its intergenerational redistributive effects and its interaction with the demographic structure the paper uses a general equilibrium model with overlapping generations an energy module and a public finance module that distinguishes between non ageing related public spending and a pension regime policy scenarios compare the consequences of different scenarios of recycling a carbon tax through lower proportional income taxes rather than higher public lump sum expenditures they are computed for two countries with different demographics france and germany results suggest that the magnitude of the second dividend is significantly related with the demographic structure the more concentrated the demographic structure on cohorts with higher income and saving rate the stronger the effect on capital supply of the second dividend the second dividend weighs on the welfare of relatively aged working cohorts it fosters the wellbeing of young working cohorts and of future generations the more concentrated the demographic structure on aged working cohorts the higher the intergenerational redistributive effects of the second dividend

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

making the transition to prepaid medicare the medicare system is facing a financial crisis brought on by a combination of factors 1 a financing system that relies on intergenerational transfers from workers to the elderly as its major source of revenue 2 a payment scheme that traditionally has provided neither the demand nor the supply side of the market with strong incentives to hold down costs and 3 the penchant of congress to expand the coverage of the system over time every time a worthy cause or group can be identified the expansion of medicare benefits began almost immediately after the passage of the legislation in 1967 just one year after medicare had passed congress increased the number of days of in patient hospital care covered by the program in 1972 payment for the services of interns and residents in podiatry training was added to the benefit package also medicare coverage was extended to disabled persons under age 65 who were eligible for benefits under social security or railroad retirement and to certain other individuals under age 65 suffering end stage renal disease later medicare benefits were extended to state and local government employees not covered by social security and then coverage was extended to spouses of workers who were not yet covered but would be eligible to be covered in 1980 unlimited home health visits were covered as was the use of alcohol detoxification facilities in 1985 medicare provided payment for liver transplant services 1 there is current political pressure to

lifetime income redistribution by the old age state pension in the netherlands abstract this paper looks at how the dutch general old age pensions act impacts the distribution of equivalent lifetime income using a dynamic cross sectional microsimulation model considering both vertical and horizontal redistributional effects the paper shows that lifetime redistribution is considerably smaller than the redistribution measured on the basis of a period approach the horizontal lifetime redistribution is more important than the vertical one but this effect is rather limited in particular due to the increasing premium percentages in combination with the regressive nature of the contribution levying

the role of group size in group lending abstract this paper explores group size in joint liability lending primarily in the adverse selection framework with local borrower information a single standardized contract that imposes full joint liability subject to a limited liability cap is optimal further if gross returns to borrowing are moderately high this contract results in perfectly efficient lending if groups are large enough however raising group size accomplishes nothing if there is no local borrower information these results show that more is required for efficient lending than full within group insurance and highlight a complementarity between group size and social capital very similar results are shown in two different settings ex ante and ex post moral hazard though the type of social capital that complements group size varies across the settings taking a step toward modeling drawbacks of larger groups it is shown that if information deteriorates sufficiently with group size an intermediate group size does better than either extreme simulations suggest that most of the efficiency gains from larger groups are realized in group sizes below ten and that outreach and efficiency can increase dramatically when a moderate group size threshold is crossed

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

observing unobservables identifying information asymmetries with a consumer credit field experiment information asymmetries are important in theory but difficult to identify in practice we estimate the presence and importance of hidden information and hidden action problems in a consumer credit market using a new field experiment methodology we randomized 58 000 direct mail offers to former clients of a major south african lender along three dimensions i an initial offer interest rate featured on a direct mail solicitation ii a contract interest rate that was revealed only after a borrower agreed to the initial offer rate and ii a dynamic repayment incentive that was also a surprise and extended preferential pricing on future loans to borrowers who remained in good standing these three randomizations combined with complete knowledge of the lender s information set permit identification of specific types of private information problems our setup distinguishes hidden information effects from selection on the offer rate via unobservable risk and anticipated effort from hidden action effects via moral hazard in effort induced by actual contract terms we find strong evidence of moral hazard and weaker evidence of hidden information problems a rough estimate suggests that perhaps 13 to 21 of default is due to moral hazard asymmetric information thus may help explain the prevalence of credit constraints even in a market that specializes in financing high risk borrowers

disequilibrium models with rational expectations an application to the uk labour market this paper develops and estimates an explicit switching model for the u k labour market which includes expectations terms in the labour demand function these expectations terms are dealt with by using the rational expectations hypothesis

financial performance and outreach a global analysis of leading microbanks microfinance contracts have proven able to secure high rates of loan repayment in the face of limited liability and information asymmetries but high repayment rates have not translated easily into profits for most microbanks profitability though is at the heart of the promise that microfinance can deliver poverty reduction while not relying on ongoing subsidy the authors examine why this promise remains unmet for most institutions using a data set with unusually high quality financial information on 124 institutions in 49 countries they explore the patterns of profitability loan repayment and cost reduction the authors find that institutional design and orientation matter substantially lenders that do not use group based methods to overcome incentive problems experience weaker portfolio quality and lower profit rates when interest rates are raised substantially for these individual based lenders one key to achieving profitability is investing more heavily in staff costs a finding consistent with the economics of information but contrary to the conventional wisdom that profitability is largely a function of minimizing cost

optimal feedback rules in an open economy macromodel with rational expectations this paper outlines procedures for deriving optimal time invariant linear feedback rules in continuous time linear stochastic models under rational expectations it also examines the derivation of optimal simple rules of a similar type these procedures are applied to an open economy model under rational expectations and the consequences of uncertainty about stochastic disturbance structures for policy design are considered the results indicate some preference for price level or nominal income rules rather than a monetary rule for the open economy

dynamic games and the time inconsistency of optimal policy in open economies it has been argued that the bretton woods system of pegged but adjustable exchange rates set up after world war ii was designed specifically to prevent the manipulation of exchange rates in pursuit of national macroeconomic objectives see r cooper so it is perhaps no coincidence that the ending of pegged rates has led to the re emergence of theories and policies involving such manipulation before the war when inflation was low and unemployment high in the major industrialised nations this involved competitive depreciation as countries tried to gain employment in the late 1970 s and early 1980 s however countries like the uk and the us have embarked on policies of competitive appreciation in order to cut inflation regarded as the first priority sharp movements in exchange rates however constitute a threat to orderly trade and stimulate protectionism as bergsten 1981 argues this abstract was borrowed from another version of this item

the multivariate flexible accelerator model its empirical restrictions and an application to u s manufacturing this paper derives an exhaustive set of restrictions implied by the multistock flexible accelerator specification of the adjustment cost model for the firm the flexible accelerator specification of the demand for capital and labor is estimated using u s manufacturing annual data for the 1947 1976 period the consistency of the data with the model is examined by testing the validity of the derived restrictions finally the conditions which permit aggregation over firms are determined and tested empirically the flexible accelerator specification has been popular in the empirical literature on interrelated investment and employment decisions see nadiri and rosen 38 coen and hickman 10 and schramm 40 more recent examples include sargent 39 berndt fuss and wavermann 4 berndt and morrison 6 and meese 34 under suitable assumptions the specification may be rationalized by the adjustment cost model of the firm eisner and strotz 13 lucas 30 mortensen 35 extends the work of lucas and derives some empirically testable restrictions of the accelerator specification that are implied by the adjustment cost framework the broad objective of this paper is to provide a more rigorous and comprehensive test of the adjustment cost model than is presently found in the literature this objective is achieved in three stages first we offer an alternative derivation of the mortensen restrictions and more importantly we prove theorem 1 that his restrictions are exhaustive i e we establish an integrability result for the flexible accelerator adjustment cost model second the flexible accelerator specification of the demand for capital and labor is estimated using total u s manufacturing annual data for the 1947 76 period it is assumed that firms minimize expected production costs subject to a technology which implies that capital and labor stocks are costly to adjust while a third factor materials is freely adjustable the consistency of the data with the adjustmentcost framework is examined by testing for the validity of the derived restrictions further we test the validity of some separability restrictions on the adjustmentcost technology that to varying degrees are imposed a priori in all of the cited empirical studies finally we provide a complete characterization of the individual firm technologies which justify the common assumption of the existence of a representative firm this problem of aggregation over firms which has been

can an oil discovery lead to a recession a comment on eastwood and venables in a recent paper in this journal eastwood and venables ev present an analysis of the macroeconomic consequence of an oil discovery in an open economy model which assumes perfect international capital mobility rational exchange rate expectations and sluggish adjustment of domestic goods prices in this note the authors attempt to reconcile this apparent contradiction in the literature in particular the authors show that ev s results hinge crucially on their failure to allow for a direct impact of higher oil wealth on money demand even when all the oil revenue accrues to the government this should raise private sector wealth through the anticipated reduction in future tax liabilities in any case the authors find it difficult to conceive a situation in which an oil discovery will raise spending but leave money demand permanently unaffected the purpose of this note is to show the important implications of this observation for the effects of an oil discovery when appropriate monetary accommodation does not take place

rich and healthy better than poor and sick an empirical analysis of income health and the duration of the pension benefit spell i analyze the relationship between duration of the pension benefit spell and pension benefit claims from the german public pension system with a special emphasis on differential results with respect to health this relationship is crucial for a potential structural pattern of redistribution between different income and health groups induced by the public pension system evidence for such redistribution from poor to rich is present for most of the specifications in my analysis the most adequate specification is partially linear does therefore not impose any parametrical restrictions between duration and benefit claims and allows for potential endogeneity the relationship i extract is clearly positive i also find that redistribution from low income individuals to individuals with high income is more pronounced the worse the health status is despite longer benefit spells for pensioners in ill health

returns to capital in microenterprises evidence from a field experiment small and informal firms account for a large share of employment in developing countries the rapid expansion of microfinance services is based on the belief that these firms have productive investment opportunities and can enjoy high returns to capital if given the opportunity however measuring the return to capital is complicated by unobserved factors such as entrepreneurial ability and demand shocks which are likely to be correlated with capital stock the authors use a randomized experiment to overcome this problem and to measure the return to capital for the average microenterprise in their sample regardless of whether they apply for credit they accomplish this by providing cash and equipment grants to small firms in sri lanka and measuring the increase in profits arising from this exogenous positive shock to capital stock after controlling for possible spillover effects the authors find the average real return to capital to be 5 7 percent a month substantially higher than the market interest rate they then examine the heterogeneity of treatment effects to explore whether missing credit markets or missing insurance markets are the most likely cause of the high returns returns are found to vary with entrepreneurial ability and with measures of other sources of cash within the household but not to vary with risk aversion or uncertainty

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

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

output the stock market and interest rates this paper develops a simple model of the determination of output the stock market and the term structure of interest rates the model is an extension of the is lm model and borrows from it the assumption that output is determined by aggregate demand and that the price level can only adjust over time to its equilibrium value however whereas the is lm emphasizes the interaction between the interest rate and output this model emphasizes the interaction between asset values and output asset values rather than the interest rate are the main determinants of aggregate demand and output current and anticipated output and income are in turn the main determinants of asset values it is this interaction that the model intends to capture its goal is to characterize the joint response of asset values and output to changes in the environment such as changes or announcement of changes in monetary and fiscal policy as the above brief description makes clear anticipations are central to the story the assumption made in this paper will be one of rational expectations the paper is organized as follows section i describes the model and sections ii iv characterize the behavior of the economy under the extreme but convenient assumption that prices are fixed forever sections v and vi extend the analysis to the case where prices adjust over time to their equilibrium value

forward looking price setting in uk manufacturing given an equilibrium pricing rule minimization of a multiperiod quadratic cost function yields a precise specification for the weights on the leads and lags of a dynamic pricing equation using an equilibrium cointegrating vector the theoretical specification is found to fit the u k manufacturing data remarkably well non nested tests fail to reject either the backward looking error correction or the forward looking model against the alternative so long as dynamic homogeneity is imposed in the error correction model this is consistent with the notion that the error correction model is conflating the true structural model which is forward looking with the expectation formation process copyright 1992 by royal economic society

can social cohesion be harnessed to repair market failures evidence from group lending in guatemala the success of group lending in developing countries has been attributed to the ability of the institution to mitigate asymmetric information problems in credit markets previous research has offered a number of explanations for this phenomenon social ties between borrowing group members internal group pressure to repay loans and peer monitoring this research presents empirical tests on borrowing group data from guatemala which indicate that peer monitoring significantly effects borrowing group performance through stimulating intra group insurance group pressure is found to have a small effect in deterring moral hazard while the effect of social ties among members is statistically insignificant

instrumental variables procedures for estimating linear rational expectations models abstract this paper illustrates how to use instrumental variables procedures to estimate the parameters of a linear rational expectations model these procedures are appropriate when disturbances are serially correlated and the instrumental variables are not exogenous we compare our procedures to some alternative estimators that estimate free parameters from restrictions implied by the euler equations the procedures are applicable to a variety of linear rational expectations models several examples of which we cite

social security outcomes by racial and education groups this article evaluates the social security outcomes for different racial and education groups outcomes differ across groups due to the interactions between group specific mortality risks and lifetime earnings the benefit formula and the benefit package which includes life insurance spousal benefits and retirement pensions based on either the rate of return or present value individuals with less education fare better than those with higher educations this holds even before accounting for preretirement survivors benefits which when accounted for reinforce this finding single whites do considerably better than single blacks when outcomes are compared by internal rates of return accounting for survivors benefits reduces regressivity but blacks continue to fare worse than whites in contrast based on present values whites generally do worse than their respective counterparts social security is primarily an intergenerational transfer system providing payments to retired workers and their families financed by payroll taxes on current workers the old age and survivors insurance oasi program also provides life insurance through survivors benefits because longer lives are positively related to income the retirement pension favors workers with higher lifetime incomes other things equal conversely survivors insurance is more likely to be awarded within groups with higher mortality rates at younger ages which happens to be those with lower incomes further the benefit formula replaces a higher percentage of the income of workers with lower lifetime earnings while spousal retirement benefits favor couples in which only one spouse works as a result any particular group s outcome depends on their lifetime earnings their group specific longevity the tax rates they face and the social security benefit formula there have been quite a few studies devoted to calculating the internal rate of return and net present value of social security some consensus has been reached by those studies early generations do better than later generations women do better than men and married couples with a single earner do better than singles or working couples these results are not surprising given that a pay as you go system usually generates a higher return in its start up phase than in the mature phase that women live longer than men and that nonworking spouses receive benefits without making tax payments however to date a consensus has not been reached on some of the more interesting but less obvious issues such as how different income classes or different races fare in the system this article

the effect of oil discoveries on the british economy theoretical ambiguities and the consistent expectations simulation approach the finding of oil in the north sea has stimulated the interest of u k economists in the effect of resource discoveries on an open economy this has spawned a large number of theoretical papers including those by neary 1983 eastwood and venables 1982 buiter and miller 1981 and neary and purvis 1981 these papers are primarily concerned with the various dynamic effects which are likely and have typically assumed perfect capital mobility and perfect foresight in order to keep the analysis tractable however it turns out that these models can say nothing about the dynamic response to an oil discovery unless some unrealistic assumptions are made about the associated monetary effects this is demonstrated in the first part of the paper this point has been made independently by neary and wijnbergen 1982 the second part of the paper describes some results obtained by simulating the treasury macroeconomic model under similar assumptions to those used in the theoretical literature in an attempt to throw some empirical light on these ambiguities

moneylenders and bankers price increasing subsidies in a monopolistically competitive market abstract in many areas of the world a significant part of the cost of obtaining a good or service is the cost of enforcing the contracts entailed in its provision we present models of markets with endogenous enforcement costs motivated by studies of rural credit markets we show that subsidies may have perverse effects under monopolistic competition increasing prices or inducing exit higher prices interest rates result from the loss of scale economies or from negative externalities among suppliers the models are consistent with the puzzling evidence that infusions of government subsidized formal credit have not improved the terms offered by moneylenders

manufacturing stocks expectations risk and co integration the modelling of firms inventory behaviour has been plagued by structural instability and despite a great deal of research effort over recent years little headway has yet been made in producing a structurally stable model of stock levels wallis et al i987 surveyed the main uk models of inventory behaviour and concluded that the tests of predictive failure are particularly powerful when conducted over periods in which data characteristics change and over half the equations we consider are rejected on the basis of their predictive performance in the early i980s this is a surprising result since the poor performance of their predecessors over this period was a prime motivation for the research that has led to the current specifications the similarity in turning points in the forecast errors both for the aggregate stockbuilding equations and for the different categories of stocks suggests the omission of some factor s common to all specifications wallis et al i987 p 144 their analysis was conducted using within sample stability tests and more recent data would undoubtedly find an even higher rejection rate accordingly this paper seeks to identify important omitted components or misspecification in the existing models of inventory behaviour in response to the suggestion in the last sentence of the wallis et al quotation we take as our point of departure a number of recent papers on company sector behaviour which have focused on intertemporal optimisation under rational expectations the seminal work of sargent 1978 on the demand for labour has been followed by a number of studies which seek to treat the firms expectations of future variables in an explicit way this work includes nickell 1 984 and henry and wren lewis i 984 on the labour market and hall et al i986 on the determination of stock levels one common finding amongst these and many other papers is that of a root in the dynamic process under consideration which is close to unity this means that the long run solution for the model is poorly determined and this finding is a cause for some concern recently with the growth of the literature on cointegration see engle and granger 1987 hall i986 this finding takes on an even more serious aspect since a symptom of non cointegration is the lack of a well defined long run solution so the finding of a near unit root may be indicative that earlier researchers were in fact working with sets of variables which failed to cointegrate which would inevitably lead to spurious regression problems in the sense of granger and newbold i 974

how robustness can lower the cost of discretion model uncertainty has the potential to change importantly how monetary policy is conducted making it an issue that central banks cannot ignore using a standard new keynesian business cycle model this paper analyzes the behavior of a central bank that conducts policy under discretion while fearing that its model is misspecified the main results are as follows first policy performance can be improved if the discretionary central bank implements a robust policy this important result is obtained because the central bank s desire for robustness directs it to assertively stabilize inflation thereby mitigating the stabilization bias associated with discretionary policymaking second the central bank s fear of model misspecification leads it to forecast future outcomes under the belief that inflation in particular will be persistent and have large unconditional variance raising the probability of extreme outcomes private agents however anticipating the policy response make decisions under the belief that inflation will be more closely stabilized that is more tightly distributed than under rational expectations finally as a technical contribution the paper shows how to solve with robustness an important class of linear quadratic decision problems

the international transmission of policy announcement effects abstract this paper extends recent work on the effects of fiscal and monetary policy in two country models by considering an additional channel through which the effects of policy announcements may be transmitted the term structure of interest rates previous work suggests that policy announcements have no impact on worldwide aggregates and merely cause a redistribution of demand and output between the domestic and important impact effects on worlwide aggregates which necessarily introduces ambiguities concerning the effects of policy announcements on foreign output and employment

the gains from pension reform we classify social security pension systems in three dimensions actuarial versus non actuarial funded versus unfunded and defined benefit versus defined contribution systems recent pension reforms are discussed in terms of these dimensions shifting to a more actuarial system reduces labor market distortions although limiting the scope for redistribution shifting to a funded system may increase saving redistribute income to future generations and distort contermporary labor supply a partial shift to a funded system helps individuals diversify their pension assets a shift from a defined benefit to a defined contribution system means that income risk will be shifted from workers to pensioners

group versus individual liability short and long term evidence from philippine microcredit lending groups abstract group liability in microcredit purports to improve repayment rates through peer screening monitoring and enforcement however it may create excessive pressure and discourage reliable clients from borrowing two randomized trials tested the overall effect as well as specific mechanisms the first removed group liability from pre existing groups and the second randomly assigned villages to either group or individual liability loans in both groups still held weekly meetings we find no increase in short run or long run default and larger groups after three years in pre existing areas and no change in default but fewer groups created after two years in the expansion areas

the welfare case for the european monetary system abstract this paper argues that the european monetary system can be interpreted as a cooperative game yielding benefits to its members a simple model is set up in which it is shown that the ems solution is superior to nash if the menber countries differ this superiority to nash may require an occasional realignment it will also then require that there be no sterilization of foreign exchange interventions since otherwise the system would collpase the ems is interpreted in this paper as an arrangement manner and not o bretton woods type of arrangement when there is a leader follower relationship inside

does medicare benefit the poor abstract measuring the progressivity of age targeted government programs is difficult because no single data set measures income and benefit use throughout life previous research using zip code as a proxy for lifetime income has found that medicare benefits flow primarily to the most economically advantaged groups and that the financial returns to medicare are often higher for the rich than the poor however our analysis produces the starkly opposed result that medicare is an extraordinarily progressive public program in dollar terms or welfare terms these new results owe themselves to our measurement of socioeconomic status as an individual s education rather than the geographically aggregated measures of income used by previous research we argue that individual education has important practical and conceptual advantages over geographically aggregated measures of income our results suggest the crucial importance of accurate poverty measurement in evaluating the progressivity of complex government programs like medicare or social security

long term relationships of major macro variables in a resource related economic model of australia a cointegration analysis abstract the paper reports the results of a simple cointegration analysis applied to bivariate causality models using data on resource output oil prices terms of trade current account and output growth to investigate the long term relationships in the sense of granger among these major macroeconomic aggregates in a resource related economic model of australia for the period 1960 90 the empirical evidence indicates that these five macro variables as formulated in our model are not random walks in addition resource production and oil prices are significantly cointegrated and they are also significantly cointegrated with the current account terms of trade and economic growth these findings provide support to the long term adjustments foundation of our resource related model

macro models and macro policy in the 1980s macroeconometric models play a key role in the policy making process they provide a consistent and comprehensive account of the various eco nomic interactions quantified with reference to historical data a treasury economist testifies that we could not operate at all effectively in policy analysis without the model odling smee 1989 p 34 models are simplifications however focus ing attention on the problem at hand changing when that focus of attention changes and changing when forecast failures highlight inadequacies in existing specifications moreover they are built in accordance with an underlying view of the way the world worics and the available data cannot always provide a clear discrimination between competing views thus models are not only an essential part of the policy analyst s equipment but also a reflection of economic opinion and policy concerns in this spirit our paper analyses the changes in and the interactions between modelling and policy making in the 1980s

the effects of differential mortality rates on the progressivity of social security does the old age and survivors insurance portion of social security become regressive once we allow for the shorter lifespan of poor people this paper compares the net returns of poor households to the net returns of other households after taking into account differential longevity earnings and social security tax and benefit histories are simulated for u s families of various income levels in the 1925 birth cohort these tax and benefit profiles are then weighted by the agents probabilities of survival for some plausible values of key mortality parameters differences in mortality eliminate the progressive spread in returns across income categories excerpt

capital market effects of the ageing population abstract the present article aims at showing the influences of the ageing of the population on the capital market supply of the pension funds in the long run the analysis covers the period 1990 2025 and makes use of an extended version of an economic and demographic computational model published in huijser and van loo 1986 the calculated scenarios show the relation between a number of assumptions about economic variables and the future development of the pension funds operations

modeling overlapping generations in a complementarity format abstract this paper provides an introduction to numerical simulation of overlapping generations models with perfect foresight and finite lifetimes the exposition presents the fundamental characteristics of this class of problems and gams programs illustrate how models can be formulated in applied research using the complementarity framework issues addressed in the paper include how to calibrate to baseyear data and how to represent international trade bequests government tax and expenditure policies and a labor leisure choice with endogenous retirement

refinancing mfis with market power theory and evidence this paper presents a model of the complete microcredit financing chain investor miv mfi micro borrower in which social minded mivs provide funds only to those mfis which do not exploit their bargaining power towards micro borrowers the mfis with the highest bargaining power do not use miv capital since eschewing their market power is most costly for them consistent with this prediction of the theoretical model we find empirically that the net interest margin as a measure of mfi market power negatively affects the likelihood of using miv finance this lends support to the view that social criteria play an effective role in mivs investment policies thereby also impacting mfis lending behavior