Book excerpt: Employing analytical tools borrowed from game theory, Carles Boix offers a complete theory of political transitions, in which political regimes ultimately hinge on the nature of economic assets, their distribution among individuals, and the balance of power among different social groups. Backed up by detailed historical work and extensive statistical analysis that goes back to the mid-nineteenth century, this book explains, among many other things, why democracy emerged in classical Athens. It also discusses the early triumph of democracy in both nineteenth-century agrarian Norway, Switzerland and northeastern America and the failure in countries with a powerful landowning class.