Suppose that each worker must use only one shovel to dig a trench, and shovels are useless by themselves. In the long run, the firm's cost function is

Assuming all else equal, if a household is optimistic about future income, it is likely to cause:

A) the current credit supply curve of the household to shift to the left. B) an upward movement along the current credit supply curve of the household. C) the current credit supply curve of the household to shift to the right. D) a downward movement along the current credit supply curve of the household.

Bill, a U.S. citizen, pays a Spanish architect to design a metal casting factory. Which country's exports increase?

a. Spain's b. the U.S.'s c. Spain's and the U.S.'s d. neither Spain's nor the U.S.'s