In the present paper we analyse for the first time as far as we know, the ancient Greek regional proto-federations, of free-democratic city-states. We examine their political institutions and policies, like common defense and external policy, military organization, representative federal bodies...

We present an extension of the Goodwin growth-cycle model that considers the rate of capacity utilization as a new variable in an adapted Lotka-Volterra system of differential equations. We derive a differential equation for the capacity utilization that is proportional to the difference between...