Fabio Mariani

From Polygyny to Serial Monogamy: A Unified Theory of Marriage Institutions

Consider an economy populated by males and females, both rich and poor. The society has to choose one of the following marriage institutions: polygyny, strict monogamy, and serial monogamy (divorce and remarriage). After having identified the conditions under which each of these equilibria exists, we show that a rise in the share of rich males can explain a change of regime from polygyny to monogamy. The introduction of serial monogamy follows from a further rise in either the proportion of rich males, or an increase in the proportion of rich females. Strict monogamy is a prerequisite to serial monogamy, as it promotes the upward social mobility of females more than polygyny. We also show that polygyny is compatible with democracy.

The political economy of naturalization

This paper presents a political economy model in which selfinterested natives decide when citizenship and/or voting rights should be granted to foreignborn workers. Native voters know that immigrants hold different political preferences and would thus tend to postpone their enfranchisement as much as possible. They also consider, however, that a more restrictive naturalization policy may reduce the gains from immigration. We find that the optimal timing of naturalization depends on the quantity, quality (productivity), and preferences of potential immigrants, the political composition and the age structure of the native population, as well as the sensitivity of migration choices to the citizenship issue.

Diasporas and Conflict

We build a model of conflict in which two groups contest a resource and must decide on the optimal allocation of labor between fighting and productive activities. In this setting, a diaspora emanating from one of the two groups can get actively involved in the conflict by transferring financial resources to its origin country. We find that the diaspora influences the war outcome and, above a certain size, contributes to the escalation of violence. Given the characteristics of the conflict equilibrium, the two groups of residents prefer to negotiate a peaceful settlement if there exists a sharing rule that makes both of them better off than war. We then identify the characteristics of the economy such that the diaspora acts as a peace-wrecking force or triggers a transition towards peace. A dynamic version of the model with an endogenous diaspora allows us to analyze the joint evolution of migration and conflict in the home country, discuss the role of openness to migration and the possibility of multiple equilibria, and draw some policy implications.