Mancur Olson's theory of the decline of nations is path-breaking in political economics. It has been tested cross-sectionally in numerous empirical studies. We survey the existing results briefly, with a special focus on studies using the number of lobbies as an exogenous variable. Using data...

In the last two decades of the XIX century Italy became an industrial country. Historians maintain that this process was affected by the action of some interest groups that pursued both state protection from competition and specific public expenditure programs. Starting from the economic...

With interest groups significantly affecting economic performance (according to Mancur Olson) and a vital interest of governments in economic growth and low unemployment in order to win elections, there should be a link between political business cycles and the evolution of lobbies over time...