Chapter 16. Wholesale Banking and Bank Runs in Macroeconomic Modeling of Financial Crises There has been considerable progress in developing macroeconomic models of banking crises. However most of this literature focuses on the retail sector where banks obtain deposits from households. In fact the recent financial crisis that triggered the Great Recession featured a disruption of wholesale funding markets where banks lend to one another. Accordingly to understand the financial crisis as well as to draw policy implications it is essential to capture the role of wholesale banking. The objective of this chapter is to characterize a model that can be seen as a natural extension of the existing literature but in which the analysis is focused on wholesale funding markets. The model accounts for both the buildup and collapse of wholesale banking and also sketches out the transmission of the crises to the real sector. We also draw out the implications of possible instability in the wholesale banking sector for lender of last resort policy as well as for macroprudential policy.