Before the 2008 financial crisis, the Federal Reserve (Fed) regularly conducted repurchase agreements (repos) in a fairly modest size with primary dealers to adjust the supply of reserves in the banking system and to keep the federal funds rate at the target set by the FOMC. During the economic downturn that followed the financial crisis, the Fed engaged in large scale asset purchases in order to provide additional monetary accommodation, and those purchases significantly increased the supply of reserves and eliminated the need for the Fed to engage in repo operations to increase reserves in the system.