Articles scientifiques

A strong paradox of multiple elections


Social Choice and Welfare

1998, vol. 15, n°2, pp.237-238

Départements : Economie et Sciences de la décision

We consider a stronger version of the paradox of multiple elections and show that it is possible that not only the winning combination of propositions, but also all the combinations sufficiently close to it, receive zero votes

Basic Statistics on the Success Rate and Profits for Independent Inventors


Entrepreneurship: Theory and Practice

Winter 1998, vol. 23, n°2, pp.41-48

Départements : Economie et Sciences de la décision, GREGHEC (CNRS)

1,095 responses were received from a telephone survey of Independent Inventors. The majority of inventors surveyed (89%) are male, and a plurality of their Inventions are designed for consumer products (47%). Conditional on commercializing their invention, and at development costs about 1/8 of those in established firms, Inventive efforts by independent inventors lead to gains virtually comparable to those of established firms. Their innovations survive for about as long as the average start-up. Gross profit margins are comparable to the pharmaceutical industry (29%). However, only a small fraction of inventions developed by independent inventors reach the market (6.5%). The probability of reaching the market is four to eight times less than for Inventions developed by established firms. Why do only a fraction of inventions developed by Independent inventors become commercialized when those that do commercialize are quite profitable and survive for as long as other start-ups?

Constrained Suboptimality in Incomplete Markets: A General Approach and Two Applications

A. CITANNA, A. Villanacci, A. Kajii

Economic Theory

1998, vol. 11, pp.495-521

Départements : Economie et Sciences de la décision

In this paper we re-examine generic constrained suboptimality of equilibrium allocations with incomplete numeraire asset markets. We provide a general framework which is capable of resolving some issues left open by the previous literature, and encompasses many kinds of intervention in partially controlled marl;et economies. In particular, we establish generic constrained suboptimality, as studied by Geanakoplos and Polemarchakis, even without an upper bound on the number of households. Moreover, we consider the case where asset markets are left open, and the planner can make lump-sum transfers in a limited number of goods. We show that such a perfectly anticipated wealth redistribution policy, though consistent with the assumed incomplete financial structure, is typically effective

Duality and markovian strategies


International Journal of Game Theory

décembre 1998, vol. 27, n°4, pp.577-597

Départements : Economie et Sciences de la décision, GREGHEC (CNRS)

We introduce the dual of a stochastic game with incomplete information on one side, and we deduce some properties of optimal strategies of the uninformed player.

Finite row-column exchangeable arrays

B. Bassan, M. SCARSINI

Commentationes Mathematicae Universitatis Carolinae

1998, vol. 39, pp.137-145

Départements : Economie et Sciences de la décision