Pooling and Separating Equilibria in Insurance Markets with Adverse Selection and Distribution Costs

In the Rothschild-Stiglitz [1976] model of a competitive insurance market with adverse selection, pooling equilibria cannot exist. However in practice, pooling contracts are frequent, notably in health insurance and life insurance. This is due to the fact that distribution costs are nonnegligible and increase rapidly when more contracts are offered. We modify accordingly the Rothschild-Stiglitz model by introducing such distribution costs. We find that, however small these costs may be, they entail possible existence of pooling equilibria. Moreover, in these pooling equilibria, it is the high-risk individuals who are rationed, in the sense that they would be willing to buy more insurance at the current premium/insurance ratio.     

On the Consumer Value of Complementarity: A Benefit Function Approach

The article develops a conceptual model of the consumer value of complementarity and illustrates its usefulness in an application to fisheries. Complementarity arises when some goods have a positive effect on the marginal value of other goods. We propose a measurement of the value of complementarity based on the benefit function. Our econometric analysis of fish consumption in Italy examines these issues, with special attention given to dynamics. Our results show that, while short-run fish demand is characterized by substitution relationships, complementarity does develop in the intermediate run and in the long run.     

A variational approach for pricing options and corporate bonds

Summary We show that option prices can always be obtained as the values of simple optimization problems. This easy remark has two consequences: sensitivity analysis is simplified (by applying the envelope theorem) and numerical procedures are improved. We give two examples of applications: options on coupon bonds and corporate bonds.     

International projects'' changing patterns: Sales engineers'' changing roles

Dealing with international projects, a reflexion on recent changes of international environment as well as client expectations suggests to emphasize the importance of two additional types of business relationships which tend to complete the “traditional” big international bi-/multi-laterally supported projects scheme: — (a) big international “self-supporting” projects requiring partnership with client or, even, direct provider's involvement (if not investment), — (b) big multi-national clients developing a huge range of projects of all size worldwide, with a more or less developed need of integration of sourcing.The key issue for the providers lies, in fact, in the organisation of relationships with existing and potential clients in those two developing types of complex international operations. Hence, it suggests to re-define the company contacts systems with the client and, above all, the role and profile of the sales engineers, traditionally in charge of these responsabilities.The purpose of this article is to evaluate the environmental changes as well as their impact on international project features and to make a first attempt to evaluate the consequences of these changes on coordinators'/managers' profiles.     

An econometric analysis of the effects of market liberalization on price dynamics and price volatility

The paper investigates price dynamics under market liberalization, with a focus on the effects of lowering price floors. We analyze price dynamics by specifying and estimating a dynamic Tobit model under time-varying volatility, where the market price is censored by a government-set support price. The model is applied to the U.S. butter market over the last three decades. The econometric results show how the price support program affects both expected prices and the volatility of prices. It is found that the censoring effects of a price support program can be significant and large even if the price support is set relatively low.

Factors substitutability,heterogeneity and endogenous fluctuations in a finance constrained economy

Summary.   This paper examines the local properties of perfect foresight equilibrium of a finance constrained economy featuring two classes of infinitely-lived agents with heterogeneous general preferences. It is primarily concerned with the conceivability of endogenous fluctuations for large plausible capital-labor elasticities of substitution. It is notably shown that heterogeneity in preferences allows Hopf cycles to be entirely consistent with a wide range of elasticities of substitution including the unitary one (Cobb-Douglas specifications). Received: April 23, 1999; revised version: January 24, 2000