We study a two-period economy in which agents preferences take into account their relative economic position. The study builds on a decision theoretic analysis of the social emotions that underlie these relative concerns. These emotions, envy and pride, respond to social losses and gains,...

En este artículo se obtienen dos caracterizaciones de las asignaciones de equilibrio walrasiano en economías de intercambio con un número finito de consumidores. Ambas caracterizaciones se establecen en términos del poder de veto de la "gran coalición", formada por todos los agentes de la...

We integrate and sharpen two characterizations of aggregate excess demand functions: we obtain Mas-Colell's (1977) equilibrium invariance, and strengthen Geanakoplos' (1984) weakly concave utility functions to strictly concave ones. Our proofs modify and extend Geanakoplos' utility-construction....

For continuous aggregate excess demand functions of economies, the existing literature (e.g. Sonnenschein (1972, 1973), Mantel (1974), Debreu (1974), Mas-Colell (1977), etc.) achieves a complete characterization only when the functions are defined on special subsets of positive prices. In this...

Modern exchange theories model a large market, but do not explain single exchanges. This paper considers the phenomenon of single exchange and formulates the general exchange problem in the form of a system of two equations, subjective and objective. Subjective equilibrium is given by the...

In this paper, we revisit a long-standing question on the structure of strategy-proof and Pareto-efficient social choice functions (SCFs) in classical exchange economies (Hurwicz (1972)). Using techniques developed by Myerson in the context of auction-design, we show that in a specific...

In this paper, a new concept of "limit information" is introduced and studied for Arrow-Debreu type economies with asymmetrically informed agents. The concept is based on the so-called contractual approach that presumes that agents meet and form coalitions, where the concurrent exchange of...

In an exchange economy with incomplete information, the signaling core is defined by the set of state-contingent allocations to which no coalitions object under informational leakage through proposals by informed agents. An objection underlying the signaling core is supported by a sequential...

A new concept of contract-based domination by coalitions for competitive economies is proposed and studied in the paper. This concept is based on the notion of (barter) contract (an elementary exchange of commodities). Here classical coalitions domination is transferred onto systems (webs) of...