The overlapping expectations and the collective absence of arbitrage conditions introduced in the economic literature to insure existence of Pareto optima and equilibria when short-selling is allowed and investors hold a single belief about future returns, is reconsidered. Investors use measures...

This article reconsiders the theory of existence of efficient allocations and equilibria when consumption sets are unbounded below under the assumption that agents have incomplete preferences. It is motivated by an example in the theory of assets with short-selling where there is risk and...

This article analyzes Katona's theory of expectations and compares it to that of Keynes and Hicks. It discusses the implicit and explicit debates on the introduction of psychology in economic theory. The aim of this paper is twofold: define Katona's thought and examine the impact of this work on...

This article investigates whether the formation of individual inflation expectations is biased towards a consensus and is thus subject to some kind of herding behavior. Basing on the traditional Carlson-Parkin approach to quantify qualitative survey expectations and its extension by Kaiser and...

This article investigates whether the formation of individual inflation expectations is biased towards a consensus and is thus subject to some kind of herding behavior. Basing on the traditional Carlson-Parkin approach to quantify qualitative survey expectations and its extension by Kaiser and...

This article investigate the role of social influence for the expectation formation of economic agents. Using self-organizing Kohonen maps the repeated cross-section data set of the University of Michigan consumer survey is transformed into a pseudo panel allowing to monitor the expectation...

Since they have been increasingly used in economics, elicitation rules for subjective beliefs are under scrutiny. In this paper, we propose an experimental design to compare the performance of such rules. Contrary to previous works in which elicited beliefs are compared to an objective...

The theory of existence of equilibrium with short-selling is reconsidered under risk and ambiguity modelled by risk averse variational preferences. A sufficient condition for existence of efficient allocations is that the relative interiors of the risk adjusted sets of expectations overlap. This...

I establish, in simple deterministic overlapping generations economies, that if each agent holds rationally formed expectations in the sense that any other expectations justifying his choices imply a smaller likelihood for the history he observes with limited memory, then there are rationally...

A general framework is suggested to describe human decision making in a certain class of experiments performed in a trading laboratory. We are in particular interested in discerning between two different moods, or states of the investors, corresponding to investors using fundemental investment...