13 For an example of early research on this topic, see Bernanke and Gertler (1989). Other important pre-crisis  studies include the development of the financial accelerator model by Bernanke and others (1999a) and work by Kashyap and Stein (2000) and Peek, Rosengren, and Tootell (2003) on the bank balance sheet channel and the effects of bank loan supply shocks.
For a more recent summary of the role of banks in the monetary transmission mechanism, see Peek and Rosengren (2013). Chaney, Sraer, and Thesmer (2012) provide evidence for the collateral channel of real estate for corporate investment, while Mian, Rao, and Sufi (2013) examine the influence of household balance sheets on consumption.