The United States represents a pure command system, with government directly accounting for a little more than one-half of all economic activity

The percentage of the national debt held by foreigners is approximately 25 percent

a. True b. False Indicate whether the statement is true or false

If a worker responds to an increase in the opportunity cost of leisure by taking more leisure, then her labor supply curve is

a. upward sloping. b. backward sloping. c. horizontal. d. vertical.