A market in which national currencies are traded by households, firms and governments, is referred to as a(n)

The marginal cost curve:

a. Usually declines initially as output increases and then rises with further increases in output b. Is equal to the average variable cost curve c. Usually rises initially as output increases and declines with further increases in output d. Is always constant

A totally pollution free environment should not be a primary social goal

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