Answer: a decrease in corporate taxes
Explanation: Aggregate supply refers to the total supply of goods and services available to a particular market from producers. It is the total amount of goods and services that firms are willing and able to sell at a given price level in an economy.
A decrease in the corporate taxes will not shift aggregate supply to the left because when the supply shifts to the left, the price level increases and the GDP decreases. Therefore, a decrease in corporate taxes cannot make supply shift to the left.