“Federal Reserve Issues FOMC Statement,” press release, May 1, https://www.federalreserve.gov/newsevents/pressreleases/monetary20190501a.ht m. Boivin, Jean, and Marc P. Giannoni (2006). “Has Monetary Policy Become More Effective?” Review of Economics and Statistics, vol. 88 (August), pp. 445–62. Boivin, Jean, Michael T. Kiley, and Frederic S. Mishkin (2010).
All this uncertainty led the banks and other short-term lenders to turn very cautious; interest rates on bank deposits and other sources of credit beyond just a few days rose steeply, funding in money markets became concentrated in the very short term, and concerned and uncertain lenders generally became much less willing to extend the credit needed for liquid and efficient financial markets.