•  G21;
  • G28;
  •  securitization;
  • jumbo lending;
  • capital requirements;
  • financial crisis

This paper explores the consequences of the collapse of the private-label residential mortgage-backed securities market in 2007 on banks’ originations of jumbo mortgages. We show that jumbo lending declined by more at banks that were more dependent on this market and were less well capitalized. In contrast, banks that had little dependence on this market and were well capitalized increased jumbo originations. These findings highlight how dependence on the secondary market may cause amplification of financial shocks, and the potential value of capital requirements that are higher during periods of economic growth in mitigating the amplification effects.