The concentration ratio of an industry is a measure that captures the share of the industry’s total output that is produced by its four largest firms.

Which of the following was a source of the U.S. federal government's financial revenue for World War II (1941–45)?

(a) Tariffs (b) Bond sales to other governments (c) Bond sales to the Federal Reserve System (d) Bond sales to the U.S. Congress

The returns from productive capital investment are determined by interest rates

Indicate whether the statement is true or false