The coexistence of fiat money (cash) and digital monies constitutes a system of parallel currencies as media of exchange. This paper asks whether a new (digital) currency is essential: Does a new currency allow for a better resource allocation even if a fully accepted currency is in circulation...

Summary We study how the education and retirement decision of a representative individual is affected by the demographic trend. Individuals optimally choose the date at which they leave school to work and at which they retire. Applying an OLG-model with a pay-as-you-go social security system we...