At the start - very little. Believed that it was simply a temporary dip in the economy
Increased taxes
Smoot Hawley Tariff Act, 1929 - raised import taxes - was meant to increase American trade but destroyed businesses relying on imports as well as leading to retaliatory taxes on American goods from other countries
He called business leaders to the White House to urge them not to lay off workers or cut wages
In 1931 he backed creation of the Reconstruction Finance Corporation (RFC, established 1932) to give loans to businesses etc.