Economists depict distribution of income by drawing a Lorenz curve above the diagonal

On a given morning, Franco sold 40 pairs of shoes for a total of $80 at his shoe store

a. The $80 is a real variable. The quantity of shoes is a nominal variable. b. The $80 is a nominal variable. The quantity of shoes is a real variable. c. Both the $80 and the quantity of shoes are nominal variables. d. Both the $80 and the quantity of shoes are real variables.

In the diagram, a shift from AS 1 to AS 3 might be caused by a(n):

A.  increase in productivity.
B.  increase in the prices of imported resources.
C.  decrease in the prices of domestic resources.
D.  decrease in business taxes.