If 100 units and 120 units of commodity X are supplied at N80 at different times; it means that there is?

A. a change in supply
B. a change in the quantity supplied
C. an increase in the quantity supplied
D. an increase in the quantity supplied

Correct Answer:

Option A – a change in supply

Explanation

A change in quantity supplied is a movement along the supply curve in response to a change in price, while a change in supply is a shift of the entire supply curve in response to something besides price.

From the question, the price was the same when the quantity supplied changed from 100 units to 120 units. This means the reason for the movement or shift is not because of a change in price, but due to other factors. Hence the correct option is option A. It means a change in supply is the reason for the movement.