Milton Friedman and Anna Schwartz argued that steady withdrawals from banks by nervous depositors ("hoarding") were inspired by news of the fall 1930 bank runs and forced banks to liquidate loans, which directly caused a decrease in the money supply, shrinking the economy. Bank runs continued to plague the United States for the next several years. Citywide runs hit Boston (Dec. 1931), Chicago (June 1931 and June 1932), Toledo (June 1931), and St. Louis (Jan. 1933), among others. Institutions put into place during the Depression have prevented runs on U.S. commercial banks since the 1930s, even under conditions such as the U.S. savings and loan crisis of the 1980s and 1990s.