21. Which part of the U.S. federal government is responsible for managing the federal debt? (a) the Treasury Department; (b) the Federal Reserve System; (c) the Commerce Department; (d) the Congressional Budget Office. 22. Which of the following puts a virtual floor under the unemployment rate (a level below which it is unlikely to fall)? (a) there will always be cyclical unemployment; (b) there always will be "structural" unemployment (frictional plus structural unemployment); (c) there always will be unemployment among children; (d) there always will be discouraged workers