This paper examines the recent slowdown in bank lending that has affected several large OECD countries. The analysis begins with a description of the importance of bank credit in the financial systems of the countries considered. The origins of the lending slowdown are analysed - - including the importance of deteriorating bank balance sheets and the BIS capital rules - - as well as its potential to depress economic activity. The paper concludes with a discussion of how monetary policy should react to unusually sluggish bank lending ...