In this paper we show the strong relation existing between efficiency and social welfare. We introduce the concept of Negishi path, a differentiable manifold, that show the relation existing between distributions of social weights and efficient allocation. We show that it is possible to as- sign...

The maximal domain theorem by Gul and Stacchetti (J. Econ. Theory 87 (1999), 95-124) implies that for markets with indivisible objects and sufficiently many agents, the set of gross substitutable preferences is a largest set for which the existence of a competitive equilibrium is guaranteed, and...

What is the effect of ambiguity aversion on trade? Although in a Bewley's model ambiguity aversion always lead to less trade, in other models this is not always true. However, we show that if the endowments are unambiguous then more ambiguity aversion implies less trade, for a very general class...

October 1997 (Now published: Scandinavian Journal of Economics, 100 (1998), 11--32.) <p> There are two distinct "Scandinavian consensus" approaches to public good supply, both based on agents' willingness to pay.  A Wicksell--Foley public competitive equilibrium arises from a negative consensus in...</p>

Forecasting electricity demand for future years is an essential step in resource planning. A common approach is for the system operator to predict future demand from the estimates of individual distribution companies. However, the predictions thus obtained may be of poor quality, since the...

What is the effect of ambiguity aversion on trade? Although in a Bewley's model ambiguity aversion always lead to less trade, in other models this is not always true. However, we show that if the endowments are unambiguous then more ambiguity aversion implies less trade, for a very general class...

There are two distinct "Scandinavian consensus" approaches to public good supply, both based on agents' willingness to pay. A Wicksell-Foley public competitive equilibrium arises from a negative consensus in which no change of public environment, together with associated taxes and subsidies...

Is gift-exchange inevitably to be crowded out by impersonal market exchange? The presence of a thick-market externality indicates that this is indeed likely to be the case. But reciprocity or gift-exchange induces social relations. The utility function is extended in order to take account of...

A fundamental question in monopolistic competition theory is whether the market allocates resources efficiently. This paper generalizes the Spence-Dixit-Stiglitz framework to heterogeneous firms, addressing when the market provides optimal quantities, variety and productivity. Under constant...

This paper addresses the issue of optimum population with two concerns : avoiding both the absolute repugnant solution that amounts to giving to an infinite number an infinitesimal amount and the marginal repugnant solution in which equilibrium consumption decresases with income. To avoid these...