In the market for cell phones, all of the following would cause the su

In the market for cell phones, all of the following would cause the supply of cell phones to change except:

A) an improvement in the technology used to produce cell phones.
B) an increase in the cost of labor used to produce cell phones.
C) a change in cell phone producers’ expectations.
D) an increase in the number of buyers in the market for cell phones.

ANSWER

D