Banks, sovereign risk and unconventional monetary policies

We develop a two-country model with an explicitly microfounded interbank market and sovereign default risk. Calibrated to the core and the periphery of the Euro Area, the model gives rise to a debt-banks-credit loop that substantially amplifies the effects of financial shocks, especially for the periphery. We use the model to investigate the effects of a stylized public asset purchase program at the steady state and during a crisis. We find that it is more effective in stimulating the economy during a crisis, in particular for the periphery.