separate firm-borrowing shocks from bank-supply shocks using a vast sample of matched bank-firm lending data. We decompose … aggregate loan movements in Japan for the period 1990 to 2010 into bank, firm, industry, and common shocks. The high degree of … role for granular shocks as in Gabaix (2011). We show that idiosyncratic granular bank-supply shocks explain 30-40 percent …