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In Hirshleifer's (1995) model for unitary actors, combined fighting/production abruptly breaks down when inter-group decisiveness of fighting is above a certain value (above one) or income requirements are not met. Accounting for the collective action problem, this article gives the opposite...

The notion of contagion has changed the way scientists perceive financial crises, causing heated debate on the political economy of crisis intervention. Based on a formal model that shows how a financial crisis can escalate and spread contagiously, this article analyzes game-theoretically how a...

A terrorist defends an asset which grows from the first to the second period and is attacked. With large asset growth, the terrorist's first period outcome is low caused by a large attack. With no expenditure constraint, the terrorist's total outcome is positive. With equal attack and defense...

The article proposes an enabling mechanism for the creation, adjustment and dissolution of governmental units, giving autonomy to each resident as in a direct democracy. Rather than focusing on a narrow model with restrictive and specialized assumptions, and subsequent solutions, as has been...

Joint exchange and raiding can emerge in a world of mutual raiding when the appropriated production is less valuable to the appropriator than to the defender and the defense is not too inferior to attack. The amounts of resources allocated to production and raiding and the amounts of goods...