choose to lose health plan choices from a menu with dominated option we examine the health plan choices that 23 894 employees at a u s firm made from a large menu of options that differed only in financial cost sharing and premium these decisions provide a clear test of the predictions of the standard economic model of insurance choice in the absence of choice frictions because plans were priced so that nearly every plan with a lower deductible was financially dominated by an otherwise identical plan with a high deductible we document that the majority of employees chose dominated plans which resulted in excess spending equivalent to 24 of chosen plan premiums low income employees were significantly more likely to choose dominated plans and most employees did not switch into more financially efficient plans in the subsequent year we show that the choice of dominated plans cannot be rationalized by standard risk preference or any expectations about health risk testing alternative explanations with a series of hypothetical choice experiments we find that the popularity of dominated plans was not primarily driven by the size and complexity of the plan menu nor informed preferences for avoiding high deductibles but by employees lack of understanding of health insurance our findings challenge the standard practice of inferring risk preferences from insurance choices and raise doubts about the welfare benefits of health reforms that expand consumer choice

nonlinear mean reversion in the short term interest rate using a new bayesian method for the analysis of diffusion processes this article finds that the nonlinear drift in interest rates found in a number of previous studies can be confirmed only under prior distributions that are best described as informative the assumption of stationarity which is common in the literature represents a nontrivial prior belief about the shape of the drift function this belief and the use of flat priors contribute strongly to the finding of nonlinear mean reversion implementation of an approximate jeffreys prior results in virtually no evidence for mean reversion in interest rates unless stationarity is assumed finally the article documents that nonlinear drift is primarily a feature of daily rather than monthly data and that these data contain a transitory element that is not reflected in the volatility of longermaturity yields the drift of the short term interest rate is an important determinant of a wide variety of asset prices both inside and outside the boundaries of what is often called fixed income while volatilities may be estimated relatively accurately using high frequency observations of the short rate the short rate s extreme persistence makes identifying the true shape of the drift function a particularly elusive goal if our goal is merely to fit prices then the difficulty in estimating a drift function can be avoided by backing out implied drifts using a no arbitrage approach such as hull and white 1990 or heath jarrow and morton 1992 these methods bypass the true distribution entirely focusing on solving for the risk neutral drift function that is consistent with the cross section of bond prices if our goal however is to learn from prices and to be able to assess theories such as the expectations hypothesis that link short and long rates then estimating the drift function under the true measure is unavoidable in several recent articles a variety of sophisticated econometric techniques have been brought to bear on the problem in particular

health plan choice using a unique panel dataset of health plan choices and personal characteristics of employees at a single firm this paper provides estimates of price elasticities for health insurance plans in a managed competition setting estimated price elasticities are larger in absolute value than most previous estimates and the magnitude of the price elasticity suggests that there is a place for price competition in this market we also find evidence of transition costs in switching health plans for older and less healthy employees such differential responses to price may contribute to adverse selection in this market

estimation of an asymmetric stochastic volatility model for asset returns a stochastic volatility model may be estimated by a quasi maximum likelihood procedure by transforming to a linear state space form the method is extended to handle correlation between the two disturbances in the model and applied to data on stock returns

managed competition and consumer price sensitivity in social health insurance this paper examines whether the introduction of managed competition in dutch social health insurance has resulted in effective price competition among insurance funds we find evidence of limited price competition which may be caused by low consumer price sensitivity using aggregate panel data from all insurance funds over the period 1996 1998 estimated premium elasticities of market share are 0 3 for compulsory coverage and 0 8 for supplementary coverage these elasticities are much smaller than in managed competition settings in us group insurance this may be explained by differences in switching experience and higher search costs associated with individual insurance

economic experiments hypothetical surveys and market data studies of insurance demand against low probability high impact risks a systematic review of designs theoretical insights and determinants of demand this paper provides a systematic review of the literature on 80 experimental hypothetical survey and market data studies of insurance demand against low probability high impact risks the objective of the review is to extract lessons from these studies and to outline an agenda for future research we contrast the results of experimental and survey studies to findings from market data we focus on experimental design methods insurance characteristics as well as results about theories heuristics behavioural biases and explanatory variables lessons for policymakers are drawn which can facilitate disaster preparedness

financial development and financing constraints international evidence from the structural investment model this article provides evidence that financial development impacts growth by reducing financing constraints that would otherwise distort efficient allocation of investment the financing constraints are inferred from the investment euler equation by assuming that the firm s stochastic discount factor is a function of the firm s financial position specifically the stock of liquid assets the magnitude of the changes in the cost of capital is twice as large in a country with a low level of financial development as in a country with an average level of financial development the size effect business cycles and legal environment effects are also considered copyright 2003 oxford university press

systemic co jumps abstract the simultaneous occurrence of jumps in several stocks can be associated with major financial news triggers short term predictability in stock returns is correlated with sudden spikes of the variance risk premium and determines a persistent increase decrease of stock variances and correlations when they come along with bad good news these systemic events and their implications can be easily overlooked by traditional univariate jump statistics applied to stock indices they are instead revealed in a clearly cut way by using a novel test procedure applied to individual assets which is particularly effective on high volume stocks

how individuals choose health insurance an experimental analysis an individual choosing a health insurance policy faces a complex decision environment where a large set of alternatives differ on a variety of dimensions there is uncertainty and the choice is repeated at least once a year we study decisions and decision strategies in a laboratory experiment where we create a controlled environment that closely mirrors this setting we use an electronic information board that allows to carefully monitor the individual s decision strategy the number of alternatives switching costs and the speed at which health deteriorates are varied across treatments we find that most subjects search is based more on attributes than on policies moreover we find that an increase in the number of alternatives increases decision making time makes subjects consider a lower fraction of the available information makes it more likely that subjects will switch and decreases the quality of their decisions the introduction of positive costs of switching makes people switch less often but improves the quality of their decisions finally if health deteriorates only gradually individuals tend to stick to their current policy too long

behavioral impediments to valuing annuities complexity and choice bracketing this paper examines two behavioral factors that diminish people s ability to value a lifetime income stream or annuity drawing on a randomized experiment with about 4 000 adults in a u s national

switching costs price sensitivity and health plan choice we investigate the extent to which sensitivity to health plan premiums differs across individuals according to characteristics related to the cost of switching plans our results indicate substantial variation in price sensitivity related to expected health care costs younger healthier employees are between two and four times more sensitive to price than employees who are older and who have been recently hospitalized or diagnosed with cancer we also find evidence of status quo bias estimated premium elasticities are significantly higher for new hires than for incumbent employees simulations combining our results with actuarial data illustrate the cost implications of risk related differences in price elasticity

transaction cost economics past present and future oliver williamson is the founder and chief developer of transaction cost economics tce in this brief essay on the occasion of his nobel memorial prize i offer a partial discussion of williamson s contributions by first summarizing some of the accomplishments of tce past and then sketching some of the opportunities for tce future most of the topics in both sections tce past and tce future start with a quotation from williamson s early work that i think still speaks volumes today that is while fellow travelers and successors have acted on one set of williamson s insights helping to produce the accomplishments of tce past another collection of williamson s insights has gone relatively unremarked creating some of the opportunities for tce future

dynamic behavior of a labor managed team an important result in the theory of the labor managed firm is that the firm reduces output when prices go up this issue is considered in a dynamic situation where a firm is defined as a team if the firm wants to grow it has to use existing resources which are used for current production in order to incorporate factors of production into the team it is shown that the long term steady state results remain as before but not the short term impact the labor managed firm will normally increase production when prices go up while the profit maximizing firm will reduce production copyright 1988 by the editors of the scandinavian journal of economics

consolidation or diversity choices in the structure of urban governance in very large measure issues of structure in metropolitan area governance can be characterized by a basic organization choice consolidation or diversity along several dimensions a basic policy variable is whether public decisions are to be made by a few large organizations or units of government or many small ones two key dimensions are spatial and vertical organization spatial organization refers to the drawing of political boundary lines over urban space dividing population groups into separate political constituencies the

inference on self exciting jumps in prices and volatility using high frequency measures summary dynamic jumps in the price and volatility of an asset are modelled using a joint hawkes process in conjunction with a bivariate jump diffusion a state space representation is used to link observed returns plus nonparametric measures of integrated volatility and price jumps to the specified model components with bayesian inference conducted using a markov chain monte carlo algorithm an evaluation of marginal likelihoods for the proposed model relative to a large number of alternative models including some that have featured in the literature is provided an extensive empirical investigation is undertaken using data on the s p 500 market index over the 1996 2014 period with substantial support for dynamic jump intensities including in terms of predictive accuracy documented copyright 2016 john wiley sons ltd

factors that influence transaction costs in development offsets who bears what and why abstract environmental policy instruments generate transaction costs to public and private parties there is a growing literature reporting on the size of transaction costs produced by environmental policy instruments this paper extends that literature through an analysis of the factors that influence transaction costs in environmental policy and how this influence occurs the theory based factors that influence transaction costs are categorised as 1 transaction characteristics 2 transactor characteristics 3 nature of the institutional environment and 4 nature of the institutional arrangements we examined how these factors influenced transaction costs through the analysis of two australian based development offset schemes with different policy designs we found evidence of all four theory based categories of influence in the policy case studies the degree of influence and how each factor influenced transaction costs varies across the two policies and between parties policy design as a component of the institutional environment had a particularly large bearing on transaction costs of offset buyers and the policy administrator an important contribution to transaction cost theory assumes the institutional environment as given

contracts entrepreneurs market creation and judgement the contemporary mainstream theory of the firm in perspective this survey gives an overview of the theory of the firm as it is formulated within the contemporary mainstream of economics two groupings of theories are briefly discussed principal agent and incomplete contract models next three of the most recent contributions regarding firms are considered the reference point approach is looked at first followed by a discussion of spulber s book the theory of the firm last we consider the entrepreneurial judgement perspective

exploring return dynamics via corridor implied volatility some fundamental questions regarding equity index return dynamics are difficult to address due to the latent character of spot volatility we exploit tick by tick option quotes to compute a novel corridor volatility index which may serve as an observable proxy for short term volatility exploiting this index we find that equity index volatility jumps are common symmetrically distributed and cojump with the underlying returns moreover the return volatility asymmetry is more pronounced than is generally recognized and is in force for both diffusive and jump innovations in volatility finally the index performs admirably during turbulent market conditions constituting a useful real time gauge of market stress

public benefits private benefits and policy mechanism choice for land use change for environmental benefits the choice of policy mechanisms for encouraging environmentally beneficial land use change should depend on the relative levels of private or internal net benefits and public or external net benefits a map of recommended policy mechanisms is developed depending on the relative levels of these variables positive incentives negative incentives and extension need to be targeted carefully to appropriate projects where private net benefits are closer to zero and or public net benefits are more extremely positive or negative technology development is suggested where private net costs outweigh public net benefits no action is recommended for many potential projects

does price framing affect the consumer price sensitivity of health plan choice this paper provides field evidence on how price framing affects consumers decision to switch health plans in 2009 german federal regulation required insurers to express premium differences between standardized health plans in absolute euro values relative to a federal reference price rather than in percentage point payroll tax differences representative individual level panel data and aggregated health plan level panel data on the universe of health plans show that the reform strongly increased enrollees willingness to switch plans with demand elasticities increasing fourfold the salience of premium differences and the default premium are obviously key driving forces in the decision to switch insurers

the economics of organization the transaction cost approach the transaction cost approach to the study of economic organization regards the transaction as the basic unit of analysis and holds that an understanding of transaction cost economizing is central to the study of organizations applications of this approach require that transactions be dimensionalized and that alternative governance structures be described economizing is accomplished by assigning transactions to governance structures in a discriminating way the approach applies both to the determination of efficient boundaries as between firms and markets and to the organization of internal transactions including the design of employment relations the approach is compared and contrasted with selected parts of the organization theory literature

internalization and the mne a note on the spread of ideas this paper examines the reasons for the impact of buckley and casson s the future of the multinational enterprise 1976 on research in international business ib earlier work concentrated on ownership specific advantages or locational determinants rather than the central concept of internalization the few exceptions were incomplete or not well known internalization as applied to the mne spread rapidly because of the appeal to ib researchers of an analytically powerful idea that was based on institutional economics and involved an accessible methodology the spread was also helped by the parallel growth of transaction costs in the domestic theory of the firm and the publication activity of the authors and their associates

health insurance choice and risk preferences under cumulative prospect theory an experiment we investigate how consumers choose insurance contracts when using a measure of decision quality based on individual risk preferences for this we use a laboratory experiment with a sequential design first subjects face insurance choices then we elicit risk preferences allowing for different latent decision making theories i e cumulative prospect theory and expected utility theory we find that the vast majority are cumulative prospect theory types analyzing whether subjects choose contracts consistent with their risk preferences we find that about 14 of all participants show inconsistent behavior and low decision quality yet the majority shows consistent behavior and good decision quality our results suggest that one explanation for inconsistent choices is the application of heuristics

blockchain and the evolution of institutional technologies implications for innovation policy abstract for the past century economists have proposed a suite of theories relating to industrial dynamics technological change and innovation there has been an implication in these models that the institutional environment is stable however a new class of institutional technologies most notably blockchain technology lower the cost of institutional entrepreneurship along these margins propelling a process of institutional evolution this presents a new type of innovation process applicable to the formation and development of institutions for economic governance and coordination this paper develops a replicator dynamic model of institutional innovation and proposes some implications of this innovation for innovation policy given the influence of public policies on transaction costs and associated institutional choices it is indicated that policy settings conductive to the adoption and use of blockchain technology would elicit entrepreneurial experiments in institutional forms harnessing new coordinative possibilities in economic exchange conceptualisation of blockchain related public policy an innovation policy in its own right has significant implications for the operation and understanding of open innovation systems in a globalised context

equity index variance evidence from flexible parametric jump diffusion models this paper analyzes a wide range of flexible drift and diffusion specifications of stochastic volatility jump diffusion models for daily s p 500 index returns we find that model performance is driven almost exclusively by the specification of the diffusion component whereas the drift specifications is of second order importance further the variance dynamics of non affine models resemble popular non parametric high frequency estimates of variance and their outperformance is mainly accumulated during turbulent market regimes finally we show that jump diffusion models yield more reliable estimates for the expected return of variance swap contracts

can simple informational nudges increase employee participation in a 401 k plan we report results from a field experiment in which a randomized subset of newly hired workers at a large financial institution received a flyer containing information about the employer s 401 k plan and the value of contributions compounding over a career younger workers who received the flyer were significantly more likely to begin contributing to the plan relative to their peers in the control group many workers do not participate in their employers supplemental retirement savings programs even though these programs offer substantial tax advantages and immediate returns due to matching contributions from a survey of new hires we find that many workers choose not to contribute to the plan because they have other financial priorities however some nonparticipants lack the financial literacy to appreciate the benefit these findings indicate that simple informational interventions can nudge workers to participate in retirement saving plans and enhance individual well being and retirement income security

profit or patients health benefit exploring the heterogeneity in physician altruism abstract this paper investigates physician altruism toward patients health benefit using behavioral data from hennig schmidt et al s 2011 laboratory experiment in the experiment medical students in the role of physicians decide on the provision of medical services the experimental setup allows us to identify the influence of profits and patients health benefit on the choice of medical treatment we estimate physician altruism the weight individuals attach to patients health benefit by fitting mixed logit and multinomial logit regression models to the experimental data estimation results provide evidence for physician altruism we find however substantial variation in the degree of physician altruism we also discuss some implications of our results for the design of physician payment schemes in the light of the theoretical literature

the effect of cognitive load on economic decision making a survey and new experiments abstract psychologists and economists have examined the effect of cognitive load in a variety of situations from risk taking to snack choice we review previous experiments that have directly manipulated cognitive load and summarize their findings we report the results of two new experiments where participants engage in a digit memorization task while simultaneously performing a variety of economic tasks including 1 choices involving risk 2 choices involving intertemporal substitution 3 choices with anchoring effects 4 choices over healthy and unhealthy snacks and 5 math problems we find that higher cognitive load reduces numeracy as measured by performance in math problems moreover within subject analysis indicates that cognitive load leads to more risk averse behavior more impatience over money and nominally more likelihood to anchor we do not find any evidence that cognitive load increases impatience over consumption goods or unhealthy snack choices exploiting the panel nature of our data set we find that those individuals who are most sensitive to cognitive load as measured by a large drop in their own math performance across 1 and 8 digit memorization treatments are driving much of the effect

optimal portfolios when variances and covariances can jump abstract we analyze the optimal portfolio choice in a multi asset wishart model in which return variances and correlations are stochastic and subject to jump risk the optimal portfolio is characterized by the positions in stock diffusion risk variance covariance diffusion risk and jump risk we find that including jumps in the second moments changes the optimal positions and particularly variance covariance hedging demands significantly erroneously omitting these jumps gives rise to substantial model risk furthermore variance covariance jump risk can have a significant impact on potential utility gains when the market is completed by adding derivatives as a robustness check we compare our results to those obtained for other parametrizations of wishart models from the literature as well as to various single asset models

property rights regimes and natural resources a conceptual analysis the term common property resource is an example of a term repeatedly used to refer to property owned by a government or by no one it is also used for property owned by a community of resource users such usage leads to confusion in scientific study and policy analysis in this paper we develop a conceptual schema for arraying property rights regimes that distinguishes among diverse bundles of rights ranging from authorized user to claimant to proprietor and to owner we apply this conceptual schema to analyze findings from a variety of empirical settings including the maine lobster industry

four formal izable theories of the firm in this essay i define and compare elemental versions of four theories of the firm these elemental theories are distilled from important contributions by hart holmstrom klein williamson and others although these contributions have been widely cited and much discussed i have found it difficult to understand the commonalities distinctions and potential combinations of these seemingly familiar contributions in this essay therefore i attempt to clarify these issues in three steps i begin with informal summaries of the theories then turn to simple but formal statements of each elemental theory and finally nest the four elemental theories in an integrative framework

paying for health insurance the trade off between competition and adverse selection we use data on health plan choices by employees of harvard university to compare the benefits of insurance competition with the costs of adverse selection moving to a voucher type system induced significant adverse selection with a welfare loss of 2 to 4 percent of baseline spending but increased competition reduced harvard s premiums by 5 to 8 percent the premium reductions came from insurer profits so while harvard was better off the net effect for society was only the adverse selection loss adverse selection can be minimized by adjusting voucher amounts for individual risk we discuss how such a system would work governments are increasingly turning to market forces as a way to limit the cost of social insurance traditionally social insurance programs were operated as nonmarket goods governments mandated participation in a central program collected revenues to finance the program and ran the insurance system there was no role for competition among suppliers in providing the basic benefit as the costs of social insurance have increased however the centralized model of social insurance is coming under increasing strain in the united states for example recent proposals have called for replacing the medicare program with a health care voucher for the elderly aaron and reischauer 1995 cutler 1996 the voucher would guarantee people a basic insurance plan but the plans would be privately run competition among plans would generate plan premiums and enrollments similarly longstanding proposals for social security reform have called for replacing the current system with a system of individual accounts where people would make saving investment and annuitization decisions on their own advisory council on social security 1996 feldstein 1996 the trend is not just domestic in the united kingdom the national health service has moved to encourage more competition in recent years with the establishment of hospital trusts that bid for patients and partially fixed payments to physicians

the leverage effect puzzle disentangling sources of bias at high frequency the leverage effect refers to the generally negative correlation between an asset return and its changes of volatility a natural estimate consists in using the empirical correlation between the daily returns and the changes of daily volatility estimated from high frequency data the puzzle lies in the fact that such an intuitively natural estimate yields nearly zero correlation for most assets tested despite the many economic reasons for expecting the estimated correlation to be negative to better understand the sources of the puzzle we analyze the different asymptotic biases that are involved in high frequency estimation of the leverage effect including biases due to discretization errors to smoothing errors in estimating spot volatilities to estimation error and to market microstructure noise this decomposition enables us to propose novel bias correction methods for estimating the leverage effect

does acquiring venture capital pay off for the funded firms a meta analysis on the relationship between venture capital investment and funded firm financial performance abstract researchers and practitioners frequently propose that venture capital vc is an important resource to increase the performance of funded firms especially in environments of uncertainty in this paper we scrutinize these theoretical propositions following an evidence based research approach we synthesize 76 empirical samples on 36 567 firms we find a small positive performance effect of vc investment on funded firm performance however the effect vanishes if researchers control for industry selection effects furthermore we find that the performance effect mainly relates to firm growth while profitability is unaffected we also uncover that performance effects are reduced when the funded firms are very young or very mature in addition studies focusing on ipo events which constitute the majority of studies determine a substantially smaller performance effect we discuss theoretical implications and offer suggestions for future research on vc

offering versus choice in 401 k plans equity exposure and number of funds records of over half a million participants in more than 600 401 k plans indicate that participants tend to allocate their contributions evenly across the funds they use with the tendency weakening with the number of funds used the number of funds used typically between three and four is not sensitive to the number of funds offered by the plans which ranges from 4 to 59 a participant s propensity to allocate contributions to equity funds is not very sensitive to the fraction of equity funds among offered funds the paper also comments on limitations on inferences from experiments and aggregate level data analysis how much and how to save for retirement is one of the most important financial decisions made by most people defined contribution dc pension plans such as the popular 401 k plans are important instruments of such savings by 2001 year end about 45 million american employees held 401 k plan accounts with a total of 1 75 trillion in assets holden and vanderhei 2001 an important characteristic of these plans is that the participant has responsibility over his savings among a plan s various funds how responsibly do the participants behave in particular how sensitive are participants choices to possible framing effects associated with the menu of choices they are offered to explore these questions this paper analyzes a data set recently provided by the vanguard group consisting of records of more than half a million participants in about 640 dc plans these plans offer between 4 and 59 funds in which participants can invest all plans offer at least one stock fund 635 plans

influences of transaction costs in environmental policy abstract there is a growing literature reporting the extent of transaction costs for environmental policies however understanding why transaction costs occur and why they are small or large is also important for efficient policy selection and evaluation following an analysis of the organisational economics literature and reports of the extent of transaction costs for a number of environmental policies three key influences to transaction costs in environmental policies are identified these are the following 1 the characteristics of the transaction for the environmental good 2 the nature of the transactors and 3 the current institutional environment and arrangements these affect transaction costs to the government and all other parties influenced by a policy transaction costs occur due to actions of information collection and policy design policy enactment and establishment implementation and contracting administration and monitoring and enforcement an interrogation of transaction cost influences reveals that 1 the influence varies between parties and is affected by the actions and interactions of and between all parties to a policy 2 how transaction costs are experienced varies across time and 3 who experiences transaction costs depends on the policy itself future policy selection and refinement will benefit from empirical analysis of the causes of transaction costs

the october 1987 s p 500 stock futures basis five minute changes in the s p 500 index and futures contract are examined over a ten day period surrounding the october 1987 stock market crash since nonsynchronous trading problems are severe in these data new index estimators are derived and used the estimators use the complete transaction history of all 500 stocks nonsynchronous trading explains part of the large absolute futures cash basis observed during the crash the remainder may be due to disintegration of the two markets even after adjustment for nonsynchronous trading the index displays more autocorrelation than does the futures and the futures leads the index

price and volatility co jumps abstract the nature of the dependence between discontinuities in prices and contemporaneous discontinuities in volatility co jumps has been reported by many as being elusive in terms of sign magnitude and statistical significance using a novel identification strategy in continuous time relying on trade level information for spot variance estimation as well as infinitesimal cross moments we document that a sizeable proportion of discontinuous changes in prices are associated with strongly anti correlated contemporaneous discontinuous changes in volatility assuming a possibly nonmonotonic pricing kernel we illustrate the equilibrium implications of price and volatility co jumps for return and variance risk premia

good volatility bad volatility and option pricing advances in variance analysis permit the splitting of the total quadratic variation of a jump diffusion process into upside and downside components recent studies establish that this decomposition enhances volatility predictions and highlight the upside downside variance spread as a driver of the asymmetry in stock price distributions to appraise the economic gain of this decomposition we design a new and flexible option pricing model in which the underlying asset price exhibits distinct upside and downside semivariance dynamics driven by the model free proxies of the variances the new model outperforms common benchmarks especially the alternative that splits the quadratic variation into diffusive and jump components

jumps in financial markets a new nonparametric test and jump dynamics this paper introduces a new nonparametric test to detect jump arrival times and realized jump sizes in asset prices up to the intra day level we demonstrate that the likelihood of misclassiflcation of jumps becomes negligible when we use high frequency returns using our test we examine jump dynamics and their distributions in the u s equity markets the results show that individual stock jumps are associated with prescheduled earnings announcements and other company speciflc news events additionally s p 500 index jumps are associated with general market news announcements this suggests difierent pricing models for individual equity options versus index op

inside the coasean firm why variations in competence and taste matter abstractronald coase s signal achievement relates to the role of transactions costs in two contexts the formation and maintenance of the firm and the systematic analysis of social costs these transaction cost explanations however do not offer a complete explanation of the variations observed in the internal structures of firms which are elucidated by noting the irreducible role of variations in individual competence temperament and taste in explaining both why firms are formed and how they are structured thus some firms are organized as partnerships and others as straight employment arrangements with many permutations in between sometimes these differences are driven by tax and regulatory considerations that coase well understood but these differences remain prominent even in wholly unregulated markets understanding the internal construction helps explain the difficulties faced by regulation in areas as diverse as employment discrimination law capital markets and tort liability

looking for a theory of the firm future challenges in this paper we present the main developments of the theories of the firm rooted in coase s coase r h 1937 the nature of the firm economica new series 4 386 405 seminal article we show that the two important topics of the nature and boundaries of the firm as well as the internal organization of the firm give place to essential contributions we present those contributions and their limits and then their possible developments finally we introduce the papers of this issue

the economic efficiency of backward vertical integration in the international petroleum refining industry a benefit of backward vertical integration in the petroleum refining industry is reduced uncertainly in the supply of crude oil for refining however there is no a priori reason to believe that refiners are more skilful in managing combined refining and crude oil production operations than are specialists in these functions using the concept of frontier production functions efficiency differences between firms with differing degrees of backward vertical integration are estimated backward vertical integration improves scale efficieny and reduces business risk significantly but it reduces both technical and overall economic efficiency this is the first comprehensive empirical test of the efficiency of vertical integration in the literature

multipart tariffs and bounded rationality an experimental analysis of mobile phone plan choices multipart tariff structures add to the computational challenges in choosing mobile phone connection services we study the quality of decision making in a laboratory environment where consumers only face a small set of mobile phone plan options but have to contend with different degrees of tariff complexity as well as uncertain usage our main finding is that simply eliminating the multipart tariff structure does not necessarily lead to better decisions rather it is multipart tariffs with included values in excess of monthly fees thus entailing two tier pricing structures with increasing marginal costs which lead to the worst decisions knowledgeable participants who understand mobile phone plan pricing make significantly better choices

optimal portfolio allocation with volatility and co jump risk that markowitz would like abstract we study a continuous time optimal portfolio allocation problem with volatility and co jump risk allowing prices variances and covariances to jump simultaneously differently from the traditional approach we deviate from affine models by specifying a flexible wishart jump diffusion for the co precision the inverse of the covariance matrix the optimal portfolio weights that solve the dynamic programming problem are genuinely dynamic and proportional to the instantaneous co precision reconciling optimal dynamic allocation with the static markowitz type economic intuition an application to the optimal allocation problem across hedge fund investment styles illustrates the importance of having jumps in volatility associated with jumps in price