The widespread ennoblement of the Spanish bourgeoisie in the sixteenth century has been traditionally considered one of the main causes of Iberian decline. I document and quantify the surge in ennoblement through a new time series of nobility cases preserved in the Archive of the Royal Chancery...

Catastrophic events can dramatically alter existing social and economic relationships. The consequences can be long-lasting and give rise to heterogeneity of behavior across populations. We investigate the impact of a large negative shock on altruism, trust and reciprocity in 30 small Honduran...

This paper reports experimental evidence on behaviour in an Ultimatum Game where responders have low structural information and feedback so that they have to learn the nature of the game during repeated play. The results lend support to the view that certain learning conditions are less...

It is well-known in evolutionary game theory that population clustering in Prisoner Dilemma games allows some cooperative strategies to invade populations of stable defecting strategies. We adapt this idea of population clustering to a two-person trust game. Players are typed based on their...

The recent literature suggests that people have social preferences with a self-serving bias. Our data analysis reveals that the stylized fact of declining cooperation in repeated public goods experiments results from this bias and adaptation.

We characterize the outcomes of games when players may make binding offers of strategy contingent side payments before the game is played. This does not always lead to efficient outcomes, despite complete information and costless contracting. The characterizations are illustrated in a series of...

I am revising my game theory book, which is due at the publisher's September 1, 1999. This is the preface, which discusses changes I have made.

We present a quantum solution to coordination problems that can be implemented with present technologies. It provides an alternative to existing approaches, which rely on explicit communication, prior commitment or trusted third parties. This quantum mechanism applies to a variety of scenarios...

In this note we study a very simple trial & error learning process in the context of a Cournot oligopoly. Without any knowledge of the payoff functions players increase, respectively decrease, their quantity by one unit as long as this leads to higher profits. We show that this process converges...