Suppose that lower production costs increases the supply of wheat, such that more wheat is supplied at each price level. after the increase in supply, the equilibrium quantity
a) increases
b) decreases
c) stays the same

Based on the graph, the answer to the question mentioned above is "Equilibrium Quantity Increases" which is the letter "A" in the choices. Suppose that the lower production costs increase the supply of wheat such that more wheat is supplied at each price level. After the increase is supply, the equilibrium quantity increases.

Is this from a

Agc and bgd are vertical angles