An inward, left shift in the supply curve (a decrease in supply) for pianos could be caused by _____.

A)ban increase in the price of pianos

B)improvements in the productivity of piano makers

C)an increase in the price of piano parts

D)decrease in consumer income

Respuesta :

C. An increase in the price of piano parts(raw materials). Makes the firm purchase less raw materials(piano parts) to manufacture less finished goods(pianos) therefore less products(pianos) will be supplied.