The Macroeconomic Impact of Money Market Freezes

We build a general equilibrium model featuring unsecured and secured interbank markets, and collateralized central bank funding. The model accounts for some key facts about the European money markets since 2008: i) the decline in the ratio of interbank liabilities in total bank assets since the onset of the global financial crisis; ii) the reduced ability of banks to access the unsecured market during the sovereign crisis, and their shift to secured market funding; iii) the increased reliance on central bank funding, particularly for banks in countries with a vulnerable sovereign. Using the calibrated model, we find that a decline in the share of unsecured to secured interbank market transactions, as observed during the crisis, generates a sizeable macroeconomic impact.