We study the dynamic relationship between the public debt ratio and the real interest rate. By means of a macroeconomic model of simultaneous difference equations - one for the debt ratio and the other for the real interest rate - we focus on the role of monetary policy, fiscal policy and risk...

The application in Economics of methods and tools originally thought for other disciplines is not new. In this paper we show how the compartmental approach, typical of Biology, Medicine, Chemistry, etc., can be used as a tool to represent the heterogeneity of the agents and introduce it into the...