dynamic banking a reconsideration financially intermediated and stock market consumption investment allocations with and without governmental interventions are compared in a welfare sense in overlapping generation economies with and without shocks to agents intertemporal preferences we first show that in economies with preference shocks governmental interventions subject to the same information requirements as those imposed on financial intermediaries lead to stock market allocations that are not inferior to those attained under financial intermediation second we argue that the necessary interventions are qualitatively no different from those required to implement stationary optimal allocations in olg models without shocks to agents intertemporal consumption preferences

dynamic setup reduction in production lot sizing with nonconstant deterministic demand abstract we examine three production policies under nonconstant deterministic demand and dynamic setup cost reduction where a decision to invest in setup reduction is made at the beginning of each period of a planning horizon the three production policies are the reorder point order quantity s q policy the fixed production cycle variable order quantity t q i policy and the variable production cycle variable order quantity t i q i we study the behavior of the total relevant cost and develop a lot sizing and an investment solution procedure numerical examples are provided and dynamic setup cost reduction is compared with static setup cost reduction where the decision to invest in setup reduction is made only at the initial setup

banking panics information and rational expectations equilibrium this paper shows that bank runs can be modeled as an equilibrium phenomenon we demonstrate that some aspects of the intuitive story that bank runs start with fears of insolvency of banks can be rigorously modeled if individuals observe long lines at the bank they correctly infer that there is a possibility that the bank is about to fail and precipitate a bank run however bank runs occur even when no one has any adverse information extra market constraints such as suspension of convertibility can prevent bank runs and result in superior allocations banking panics were a recurrent phenomenon in the united states until the 1930s they have re emerged as a source of public concern and much theoretical research recently in this paper we provide an information theoretic rationale for bank runs the traditional story is that contagion is an important aspect of bank runs the idea seems to be that when the general public observes large withdrawals from the banking system fears of insolvency grow resulting in even larger withdrawals of deposits in our model some individuals withdraw because they get information that future returns are likely to be low uninformed individuals observing this also have an incentive to liquidate their investments in addition some individuals need to withdraw deposits for other than informationally based reasons thus if the random realization of such a group of individuals is unusually large then the uninformed individuals will be misled and will precipitate a run on the bank the technology is such that a large volume of withdrawals involves liquidation costs consequently runs on the bank do impose social costs a mechanism that may reduce these costs in our model is to suspend convertibility if withdrawals are high however those individuals who need to withdraw their assets for liquidity reasons are worse off ex post our model provides a rationalization for restrictions in demand deposits that were widespread prior to 1929 friedman and schwartz 7 suggest that restrictions of payments ensured

the labor market for new ph d economists presents results from a survey of 450 new 1996 97 ph d economists providing information about employment underemployment employers work activities salaries and job satisfaction comparisons are made across ranks of the graduates ph d programs sectors of employment and subfields of economics as well as over time labor market outcomes for economists also are compared with those of seven other disciplines results indicate that a growing proportion of new economics ph d s start their careers in business or industry that an international market for new economics ph d s is evolving and that job outcomes for economists compare favorably with new ph d s in many other disciplines

optimal investment in setup reduction in manufacturing systems with wip inventories abstract a number of models have been proposed to predict optimal setup times or optimal investment in setup reduction in manufacturing cells these have been based on the economic order quantity eoq or economic production quantity epq model formulation and have a common limitation in that they neglect work in process wip inventories which can be substantial in manufacturing systems in this paper a new model is developed that predicts optimal production batch sizes and investments in setup reduction this model is based on queuing theory which permits it to estimate wip levels as a function of the decisions variables batch size and setup time optimal values for batch size and setup time are found analytically even though the total cost model was shown to be strictly non convex

bank liquidity and stability in an overlapping generations model in an infinitely repeated version of the diamond and dybvig 1983 model intergenerational transfers enable a bank to achieve interest rate smoothing and to provide depositors with liquidity insurance without diamond and dybvig s assumption of no side trades the bank is subject to runs that may result from either excessive withdrawals or the lack of new deposits the latter cause which cannot occur in diamond and dybvig s one generation model implies that suspension of convertibility may not prevent bank runs government intervention may be necessary to maintain bank stability article published by oxford university press on behalf of the society for financial studies in its journal the review of financial studies

an expository note on individual risk without aggregate uncertainty abstract in economies where agents bear some risk the analysis would often be facilitated by the assumption that the risks are i i d and disappear in the aggregate a formal appeal to the law of large numbers requires the consideration of a sequence of finite economies in an economy with a continuum of agents there are countable families of sets for which it is impossible for a law of large numbers to be valid with countably many agents and a finitely additive measure independence is compatible with the law of large numbers

banking as the provision of liquidity this article represents a model economy in which demand deposits represent the optimal financial intermediation because these demand deposits are backed in part by an illiquid asset the in termediary bank is subject to panics in which each agent ration ally decides to withdraw his deposits making all worse off banks ca n prevent panics only through a distortion of the optimal contract t he government can prevent panics without this distortion by guarantee ing the return from deposits the moral hazard introduced by this dep osit insurance induces the government to regulate the intermediary s portfolio and returns copyright 1988 by the university of chicago

financial contagion and depositor monitoring this paper analyzes market discipline in a many bank economy where contagion and bank runs interact we present a model with differently informed depositors where those depositors that are more informed have incentives to monitor banks investments it is shown that when banks are undercapitalized and the probability of success of the risky asset is low depositors might prefer a contract that is subject to bank runs in the interim period to a contract that allows banks to gamble with their funds and maintain their investment the results of the paper emphasize the benefits of private monitoring of banks in order to promote market discipline

anonymous job applications of fresh ph d economists abstract this paper analyzes anonymous job applications of ph d economists in the academic job market we use data on interview invitations from a randomized experiment at a european based research institution results show that the underrepresented gender was hurt by anonymous applications

from eoq towards zi zero inventory zi is a new and powerful concept to improve production efficiency underpinning zi is set up reduction and this paper examines what eventuates when set up costs are cut the folklore is that set up reduction lowers inventory and costs we obtain results contrary to that reducing set up costs need not reduce inventory for example likewise lowering set up costs need not necessarily lower total production and inventory costs furthermore most investments produce marginally decreasing returns set up cost reduction prompts the opposite it produces marginally increasing not decreasing returns a parametric algorithm that calculates the benefit of set up cost reduction is provided most presentations of zi have been descriptive with very few mathematical models of it yet untaken by modeling certain zi concepts mathematically we scrutinize their validity and sometimes invalidity

superstars and mediocrities market failure in the discovery of talent a basic problem facing most labor markets is that workers can neither commit to long term wage contracts nor can they self nance the costs of production i study the eects of these imperfections when talent is industry speci c it can only be revealed on the job and once learned becomes public information i show that rms bid exces sively for the pool of incumbent workers at the expense of trying out new talent the workforce is then plagued with an unfavorable selection of individuals there are too many mediocre workers whose talent is not high enough to justify them crowding out novice workers with lower expected talent but with more upside potential the result is an ine ciently low level of output coupled with higher wages for known high talents this problem is most severe where information about talent is initially very imprecise and the complementary costs of production are high i argue that high incomes in pro fessions such as entertainment management and entrepreneurship may be explained by the nature of the talent revelation process rather than by an underlying scarcity of talent jel d30 j31 j6 m5

distinguishing panics and information based bank runs welfare and policy implications in this paper we contrast panics and information based bank runs in an effort to provide a robust and empirically plausible model of how bank runs are triggered the model of information based runs is characterized by two sided asymmetric information the bank cannot observe the true liquidity needs of the depositors while depositors are asymmetrically informed about bank asset quality we also examine the relative degrees of risk sharing provided by bank deposit contracts and traded equity contracts we show that the choice of deposit or equity depends on the attributes of and information about the underlying investment returns

the term structure of investment and the banks insurance function abstract the article re examines the proposition first formulated rigorously by bryant a model of reserves bank runs and deposit insurance journal of banking and finance 4 335 344 1980 and diamond and dybvig bank runs deposit insurance and liquidity journal of political economy 91 401 419 1983 that in a production economy with stochastic liquidity shocks to the household sector banks serve to provide optimal intertemporal insurance to consumers the paper argues that in order to understand the moral hazard problems inherent in this insurance problem it is too narrow to consider solely the role of banks as providers of liquidity the paper develops a model with several investment opportunities in which banks have the additional function of asset diversification this pooling of intermediation functions is shown to reduce the moral hazard problem thereby enhancing the stability of depository contracts and increasing the scope of the banks insurance function

bank runs as an equilibrium phenomenon a standard demand deposit contract in which individuals are entitled to their full deposit at any time provided the bank is solvent is analyzed in a context in which there are no exogenous events on which agents condition their behavior and a unique equilibrium involving a bank run with positive probability is shown to exist

an economic production quantity model with flexibility and reliability considerations abstract the classical economic production quantity epq model assumes that items are produced by a perfectly reliable production process with a fixed set up cost while the reliability of the production process cannot be perfect without a price its set up cost can be reduced with investment in flexibility improvement an epq model with a flexible and imperfect production process is proposed in this paper this inventory optimization problem is then formulated as a geometric program gp and solved to obtain closed form optimal solutions after the theoretical treatment a numerical example is provided to illustrate how the gp theories are applied to solve a given problem finally some aspects of post optimality sensitivity analysis based on the gp approach are discussed

monetary policy under alternative bank market structures abstract the purpose of this paper is to derive and compare the short run effects of monetary policy under both perfectly and imperfectly competitive banking markets within the context of a general equilibrium framework which emphasizes the demands for and supplies of financial assets it is demonstrated that the structure of banking markets can have a bearing on the appropriate choice of policy targets and instruments specifically the federal funds rate is shown to be a potentially ineffective target instrument for policy under a competitive banking system although it can be used to produce conventional short run effects when banking markets are imperfect in contrast the level of currency and unborrowed reserves can be utilized as an effective target instrument under either form of bank market structure

preservation technology investment for deteriorating inventory abstract the objective of this study is to develop a deteriorating inventory policy when the retailer invests on the preservation technology to reduce the rate of product deterioration a solution procedure is presented to determine an optimal replenishment cycle shortage period order quantity and preservation technology cost such that the total profit per unit time is maximized a numerical example and sensitivity analysis are presented to illustrate the model

chaos sunspots and automatic stabilizers abstract we consider a real business cycle model with an externality in production depending on parameter values the model has sunspot equilibria cyclical and chaotic equilibria and equilibria with deterministic or stochastic regime switching we study the implications of this model environment for automatic stabilizer tax systems stabilization is desirable because the efficient allocations are characterized by constant employment and output growth we identify an automatic stabilizer income tax subsidy schedule with two properties i it specifies the tax rate to be an increasing function of aggregate employment and ii earnings are subsidized when aggregate employment is at its efficient level the first feature eliminates inefficient fluctuating equilibria while the second induces agents to internalize the externality

bank collapse and depression the recurrent banking panics of the 19th century and the great depression of the 1930s are widely viewed as failures of our economic system a simple version of samuelson s overlapping generations model is used to generate such failures of walrasian equilibrium the spontaneous panics generated involve a collapse of bank credit causing in turn a drop in investment demand the model suggests that both the recent technological advances in the intermediation industry and the current move towards deregulation of that industry are ominous developments

capital markets financial intermediaries and liquidity supply abstract we study a dynamic economy endowed with a sequence of overlapping generations of consumers and production processes and where productive assets are illiquid and consumption preferences are subject to uninsurable demand for liquidity we characterize the steady states that can be achieved with alternative financial systems we show that infinitely lived financial intermediaries offering a liability with age dependent restrictions may implement a social optimum with full insurance if instead they offer anonymous unrestricted contracts then only second best consumption allocations with partial insurance obtain we also examine the consumption allocations available when agents can trade shares in competitive stock markets while allowing for trade across generations may or may not improve upon generational autarky we show that this competitive equilibrium is not a social optimum and is dominated by a system of infinitely lived unrestricted intermediaries

investment policy for multiple product setup reduction under budgetary and capacity constraints abstract this paper investigates the impact of setup cost and time reduction on production batch sizes and the schedule in a batch manufacturing system producing multiple products it is assumed that the system s operating environment is deterministic and there are budgetary and capacity constraints the schedule feasibility of the embedded economic lot scheduling problem is attained by using the common cycle approach the extent of setup reduction attained is treated as a function of capital investment in technology the problem of simultaneously determining the lot sizes as well as the investments made in setup reduction for the different products with the objective of minimizing the total relevant cost is formulated as a non linear constrained optimization model a solution algorithm using the generalized lagrangian approach is developed to solve this problem a heuristic approach is also suggested for cases where the optimization procedure becomes computationally cumbersome the concepts developed are illustrated through a numerical example

active intermediation in a monetary overlapping generations economy abstract this paper establishes that the profit seeking activities of private intermediaries can ensure pareto efficiency in the standard pure exchange monetary overlapping generations economy without the need for government monetary or fiscal policy intervention moreover these profit seeking activities are shown to rule out all aperiodic and k periodic cycles for k greater than 2 contrary to much recent work on intermediation the profit opportunities that arise for intermediaries in this context are not due to assumed frictions or asymmetric information rather they are due to the dynamic open ended structure of the economy which permits debt roll over

multiple equilibria in dynamic rational expectations models a critical review abstract multiple equilibria are a ubiquitous feature of dynamic rational expectations models researchers have been divided on the implications of this phenomenon some have viewed this as a reflection of reality and a possible explanation of a wide range of economic phenomena others have suggested various selection criteria for choosing one among the many equilibria this paper reviews the major selection criteria that have been proposed and through application to three well known models shows under what circumstances one might expect them to choose the same or different equilibria in addition this paper proposes a new criteria based on the limit of finite horizon equilibria and investigates its relation to the other criteria

financial system design and liquidity provision by banks and markets in a dynamic economy this paper contributes to the literature on financial system design by comparing markets and banks in a dynamic economy investors trade off their liquidity needs against the high returns on illiquid investments both the banking system and the market can provide partial liquidity insurance to investors we consider full market participation as well as limited market participation we demonstrate that the full participation market with intergenerational trading can provide more liquidity than one without insurance is provided through wealth transfer across generations instead of cross subsidization across contemporaneous types as is the case in the finite economy given a full participation market that allows trading across generations only banks with initial capital can provide additional liquidity in a limited participation market with uncertainty about trading types an intergenerational bank with or without initial capital provides additional insurance to investors the need for trade is eliminated finally if there is no uncertainty about trading types then an intergenerational bank with initial capital eliminates the need for trading and improves welfare for all an intergenerational bank without initial capital improves welfare for people who do not trade

financial markets intermediaries and intertemporal smoothing in an overlapping generations economy with incomplete financial markets but no intermediaries there is underinvestment in safe assets in an economy with intermediaries and no financial markets accumulating reserves of safe assets allows returns to be smoothed nondiversifiable risk to be eliminated and an ex ante pareto improvement compared to the allocation in the market equilibrium to be achieved in a mixed financial system however competition from financial markets constrains intermediaries so that they perform no better than markets alone

financial intermediation in an overlapping generations model with transaction costs abstract we analyze an overlapping generations economy where agents interact to share liquidity risk we show that a pure exchange economy has excessive trade in equilibrium because agents interact to rebalance their portfolios intergenerational financial intermediaries reduce the number of interactions because agents only transact when they face liquidity needs in the absence of asset risk intermediaries match redemptions with deposits and dividends and never sell assets if the economy is subject to transaction costs the intermediated economy can sustain higher stationary investment and welfare we also find that dead weight transaction costs can increase welfare because it protects banks from interbank arbitrage and dampens the inherent cyclicality of market economies

investing in reduced setups in the eoq model this paper is motivated by the observation that the japanese have devoted much time and energy to decreasing setup costs in their manufacturing processes and that there has been little in the way of a formal framework available to use to think about such efforts the object of this paper is to begin to provide such a framework the framework developed identifies only one aspect of the advantages of reducing setups namely reduced inventory related operating costs the other advantages such as improved quality control flexibility and increased effective capacity are not accounted for in this paper nevertheless substantial reductions in setups may be warranted based solely on the benefits identified in this paper the approach taken here introduces an investment cost associated with changing the current setup level and adds a per unit time amortization of this cost to the other costs identified in the standard eoq model the general problem becomes that of minimizing the sum of a convex and a concave function in two special cases the minimization can be carried out explicitly in one of these cases numerous interpretations of the results are made including comparisons of japanese and american practices for example holding other parameters constant there is a critical sales level such that investment is made in reducing setups if and only if the sales rate is above that level when such investment is made the optimal lot size is independent of the sales rate the paper also addresses the joint selection of the setup cost and the sales rate selection of the sales rate is seen as incorporating explicit production and holding costs into the classical monopolist s pricing problem an explicit solution is obtained for the model postulated

banking and insurance abstract this paper studies the economic role of financial institutions in economies where agents incomes are subject to privately observable idiosyncratic random events the information structure precludes conventional insurance arrangements however a financial institution perhaps best viewed as a savings bank can provide partial insurance by generating a time pattern of deposit returns that redistributes wealth from agents with high incomes to those with low incomes resulting in a level of expected utility higher than that achievable in simple security markets insurance is incomplete because the bank faces a tradeoff between provision of insurance and maintenance of private incentives

optimal capacity in the banking sector and economic growth the paper investigates from the welfare and growth point of view the determination of the optimal capacity of the banking system for that purpose we consider an overlapping generation model with endogenous growth there is horizontal differentiation and imperfect competition in the banking sector macroeconomic shocks affect the return on capital and together with the expectations of depositors condition the stability of the banking sector we specify to what extent deposit insurance may reduce instability and increase the number of deposits welfare and growth we also characterize the conditions under which excess banking capacities may appear and how their reduction may improve welfare

liquidity creation through banks and markets multiple insurance and limited market access abstract the paper studies the intertemporal allocation of funds through demand deposits and anonymous markets first separately and then in an integrated model it reviews some work on the role of market frictions and asset characteristics and suggests that the interplay between these two is crucial in explaining the observed coexistence of demand deposits and anonymous markets

banking recession depression and government expenditure we examine public good expenditure given a stylized business cycle this cycle exhibits three characteristics a a full employment path b occasional drops from that path followed by reconvergence and c sustained underemployment following a large drop a banking system modeled using samuelson s overlapping generations approach propagates shocks two sources of shocks are treated anticipated future shocks to technology and inherent instability of the banking system both of which precipitate shocks to demand we conclude that under gross substitutes the government acting as competitive purchasing agent follows countercyclical policy

the fragility of short term secured funding markets abstract this paper develops an infinite horizon model of financial institutions that borrow short term and invest in long term assets that can be traded in frictionless markets because these financial intermediaries perform maturity transformation they are subject to potential runs we derive distinct liquidity collateral and asset liquidation constraints which determine whether a run can occur as a result of changing market expectations we show that the extent to which borrowers can ward off an individual run depends on whether it has sufficient liquidity collateral and asset liquidation capacity these determinants depend on the borrower s endogenous balance sheet and on exogenous fundamentals systemic runs are possible if shocks to the valuation of collateral held by outside investors are sufficiently strong and uniform and if the system as a whole is exposed to high short term funding risk the theory has policy implications for prudential regulation and lender of last resort interventions

young stars in economics what they do and where they go we construct a data set of job flyouts for junior economists between 2013 and 2018 to investigate three aspects of the market for stars first what is the background of students who become stars second what type of research does the top of the market demand third where do these students take jobs among other results we show that stars are more likely to be international and male than phds overall that theoretical and semi theoretical approaches remain dominant that american programs both produce the most stars and hire even more that almost none are hired by the private sector and that there is a strong shift toward having pre phd full time academic research jobs jel a11 a12 a23 j24