Hospital demand for physicians

This article develops a derived demand for physicians that is general enough to encompass physician control, simple profit maximization and hospital utility maximization models of the hospital. The analysis focuses on three special aspects of physician affiliations: the price of adding a physician to the staff is unobserved; the physician holds appointments at multiple hospitals, and physicians are not homogeneous. Using 1983 American Hospital Association data, a system of specialty-specific demand equations is estimated. The results are consistent with the model and suggest that physicians should be concerned about reduced access to hospitals, particularly as the stock of hospitals declines.     

UTILITY MAXIMIZATION IN A LARGE MARKET

We study the problem of expected utility maximization in a large market, i.e., a market with countably many traded assets. Assuming that agents have von Neumann–Morgenstern preferences with stochastic utility function and that consumption occurs according to a stochastic clock, we obtain the “usual” conclusions of the utility maximization theory. We also give a characterization of the value function in a large market in terms of a sequence of value functions in finite‐dimensional models.     

Price uncertainty and competitive firm behavior: Testable hypotheses from expected utility maximization

This article derives the general implications of expected utility maximization for the static model of the competitive firm under output price uncertainty for any risk preference and probability structure. Implications of the results for the empirical analysis of risk-responsive behavior under uncertainty are discussed.     

基于批发价格契约的低碳供应链协调研究——考虑互惠和利他偏好的分析视角

为弥补供应链理性经济人假设或只考虑单一偏好的缺失,基于批发价格契约建立完全自利和社会偏好下(仅零售商具有社会偏好、仅制造商具有社会偏好,以及双方同时具有社会偏好)的供应链博弈模型,分析决策主体的社会偏好对定价策略、碳减排策略、最优订购量、决策主体的利润和供应链的利润及其协调性的影响。研究发现:双方利他偏好程度的增大可激励制造商投资减排;领导者制造商的利他行为有利于减缓供应链"双重边际效用",而跟随者零售商的利他行为对供应链利润的影响与制造商的社会偏好有关;当双方的互惠偏好起主导作用且认为对方存在不友善行为时,互惠偏好会降低制造商减排积极性并会加剧供应链"双重边际效用"。上述结论延拓了供应链管理理论,为低碳供应链节点企业选择合作伙伴类型以及低碳供应链运作提供了参考。     

中小投资者的风险态度与市场环境

按照期望效用理论所揭示的风险厌恶、风险中性和风险追逐的3种风险态度的划分以及前景理论中投资者损失规避风险态度的特征,我们对我国A股市场投资者的风险偏好进行研究,发现在我国A股市场中小投资者风险态度受获得收益的显著影响,当投资者获得正收益时,总体呈现风险追逐,收益越高风险追逐的倾向越明显;当投资者获得负收益时,总体呈现风险中性,收益率与后市判断没有明显关系。我国中小投资者的风险态度不符合损失规避的特征。牛市环境下中小投资者总体呈现风险追逐,熊市环境下中小投资者总体风险中性。     

SHADOW PRICES FOR CONTINUOUS PROCESSES

In a financial market with a continuous price process and proportional transaction costs, we investigate the problem of utility maximization of terminal wealth. We give sufficient conditions for the existence of a shadow price process, i.e., a least favorable frictionless market leading to the same optimal strategy and utility as in the original market under transaction costs. The crucial ingredients are the continuity of the price process and the hypothesis of “no unbounded profit with bounded risk.” A counterexample reveals that these hypotheses cannot be relaxed.     

Why do European consumers smoke? Responses from the rational addiction model

In this paper, we test whether European consumers are addictive smokers and, if this is the case, then whether such addictions can be explained by the rational addiction theory. To this end, we start from a non‐separable intertemporal utility function, which allows us to derive a demand function that is estimated using tobacco time‐series. The results are in accordance with the model of rational addiction for all European smokers. Thus, we observe the addictive character of tobacco consumption and, secondly, we note that the addiction is not the result of myopic consumer behaviour, but rather of the maximization of total utility, implying that consumers consider the future effects of their current decisions.     

On the market viability under proportional transaction costs

This paper studies the market viability with proportional transaction costs. Instead of requiring the existence of strictly consistent price systems as in the literature, we show that strictly consistent local martingale systems (SCLMS) can successfully serve as the dual elements such that the market viability can be verified. We introduce two weaker notions of no arbitrage conditions on market models named no unbounded profit with bounded risk (NUPBR) and no local arbitrage with bounded portfolios (NLABPs). In particular, we show that the NUPBR and NLABP conditions in the robust sense are equivalent to the existence of SCLMS for general market models. We also discuss the implications for the utility maximization problem.     

Why the self-employed are happier: Evidence from 25 European countries

Using survey data from 25 European countries, we can show that in most of the countries the self-employed are more satisfied with their jobs than employees. This paper aims to discuss the reasons why this is the case. The results show that part of the differences in job satisfaction between employees and self-employed individuals are due to creativity and autonomy in self-employment. This suggests that our results are in line with procedural utility theory ( and ). In other words, especially self-employed individuals seem to derive utility from the way outcomes are achieved.     

A metacultural approach to predicting self-employment across the globe

Drawing from neo-institutional theory, we examine the relationship between preference for entrepreneurship and actual entrepreneurship behavior across multiple countries and cultures. We elucidate how multiple societal-level cultural models, namely Hofstede, Global Leadership and Organizational Behavior Effectiveness (GLOBE), and Schwartz affect the individual-level process connecting expressed preference for self-employment and actual behavior. Our hypotheses were tested using a multilevel technique on a sample of 20,755 individuals across 24 countries. The findings indicate that the moderating effect of predominant cultural cognition is partially supported. Contributions and implications for theory and practice are also discussed.     

OPTIMAL INVESTMENT WITH INTERMEDIATE CONSUMPTION AND RANDOM ENDOWMENT

We consider an optimal investment problem with intermediate consumption and random endowment, in an incomplete semimartingale model of the financial market. We establish the key assertions of the utility maximization theory, assuming that both primal and dual value functions are finite in the interiors of their domains and that the random endowment at maturity can be dominated by the terminal value of a self‐financing wealth process. In order to facilitate the verification of these conditions, we present alternative, but equivalent conditions, under which the conclusions of the theory hold.     

A Note On Utility Maximization Under Partial Observations1

Using ideas from stochastic filtering theory and a martingale representation result of Jacod, we discuss problems of utility maximization in “dynamically incomplete” financial markets under partial observations.     

货币边际效用与需求曲线再认识

基数效用理论通常用边际效用递减来解释需求规律,但存在令人感到困惑的地方,即"货币边际效用不变"假设与边际效用递减规律相矛盾,而后者所支持的"货币边际效用递减"也常被广泛认同,这就影响了基数效用理论的解释力。本文通过分析,解释了这一矛盾,让读者全面认识货币边际效用和需求曲线。     

The CCAPM meets Euro-interest rate persistence, 1960-2000

Euro-interest rates are well-known to be persistent, as are their differentials across countries for a given maturity. The international CCAPM implies that the rates are persistent because forecasts of national consumption growth or inflation are persistent too. We examine this prediction for a panel of countries. The standard CCAPM with power utility is augmented to allow for external habit, government consumption, and adaptive learning. In all cases, we find little evidence that the persistence in Euro-rates is consistent with the CCAPM.     

A Transaction Utility Approach for Bidding in Second-Price Auctions

In both the Vickrey and eBay auctions, bidding the reservation price is the optimal strategy within the conventional utility framework. However, in practice, buyers tend to bid less than their reservation prices, and bid multiple times, thus increase their bids, in the course of an auction. In this paper, we show that both underbidding and multiple bidding behaviors can be consistent with utility maximization, if buyer's utility incorporates a transaction utility (reference price dependent) component. Transaction utility is based on the difference between the buyer's reference price and actual price paid; it captures the perceived value of the deal. More specifically, we show that the optimal bid is lower than the reservation price, but higher than the reference price. Furthermore, buyer may re-bid (above the prior optimal level) if the reference price is revised upon observing a higher current price.     

PORTFOLIO CHOICE VIA QUANTILES

A portfolio choice model in continuous time is formulated for both complete and incomplete markets, where the quantile function of the terminal cash flow, instead of the cash flow itself, is taken as the decision variable. This formulation covers a wide body of existing and new models with law‐invariant preference measures, including expected utility maximization, mean–variance, goal reaching, Yaari's dual model, Lopes' SP/A model, behavioral model under prospect theory, as well as those explicitly involving VaR and CVaR in objectives and/or constraints. A solution scheme to this quantile model is proposed, and then demonstrated by solving analytically the goal‐reaching model and Yaari's dual model. A general property derived for the quantile model is that the optimal terminal payment is anticomonotonic with the pricing kernel (or with the minimal pricing kernel in the case of an incomplete market if the investment opportunity set is deterministic). As a consequence, the mutual fund theorem still holds in a market where rational and irrational agents co‐exist.     

EVIDENCE THEORY: A MATHEMATICAL FRAMEWORK FOR UNPREDICTABLE HYPOTHESES

Shafer's evidence theory is a branch of the mathematics of uncertain reasoning that allows for novel possibilities to be conceived by a decision‐maker. Many of its findings exhibit striking similarities with an alternative decision theory put forward by Shackle in the 1950s, before expected utility maximization monopolized the scene. Evidence theory does not attempt to formalize the emergence of novelties, but it is a suitable framework for reconstructing the formation of beliefs when novelties appear. An application to decision‐making in the biotech and pharmaceutical industries illustrates the potentialities of evidence theory, as well as its shortcomings.     

RELAXED UTILITY MAXIMIZATION IN COMPLETE MARKETS

For a relaxed investor—one whose relative risk aversion vanishes as wealth becomes large—the utility maximization problem may not have a solution in the classical sense of an optimal payoff represented by a random variable. This nonexistence puzzle was discovered by Kramkov and Schachermayer (1999) , who introduced the reasonable asymptotic elasticity condition to exclude such situations. Utility maximization becomes well posed again representing payoffs as measures on the sample space, including those allocations singular with respect to the physical probability. The expected utility of such allocations is understood as the maximal utility of its approximations with classical payoffs—the relaxed expected utility. This paper decomposes relaxed expected utility into its classical and singular parts, represents the singular part in integral form, and proves the existence of optimal solutions for the utility maximization problem, without conditions on the asymptotic elasticity. Key to this result is the Polish space structure assumed on the sample space.     

Environmental Regulations in Gravity Equations: Evidence from Europe

One implication of the pollution haven hypothesis is that countries export more by applying more lenient environmental regulations. Most studies that apply gravity‐type equations do not find robust support for environmental regulations to affect bilateral exports. In this paper, we show that one can obtain robust negative effects of stringency, as long as gravity equations are well specified with respect to theory. Our results, based on the European data, are both very consistent with US studies on environmental regulations and another line of very recent studies that infer non‐biased price or substitution elasticities from trade equations. We show that more stringent environmental regulations, when depicting a pure cost effect, are reducing exports. The coefficient is even larger in the case where exporting countries are Central and Eastern European countries, comparing to the EU15. Further, we show that there is no significant difference in the impact of regulations on trade in case of dirty and clean sectors. Finally, when using GMM estimation, our environmental stringency coefficient gets significantly reinforced.