The following graph shows a decrease in short$-$run aggregate supply $($AS$)$ in a hypothetical economy where the currency is the dollar. Specifically, the short$-$run aggregate supply curve shifts to the left from $A{S}_1$ to $A{S}_2,$ causing the quantity of output supplied at a price level of $100$ to fall from $$200$ billion to $$150$ billion.

The following table lists several determinants of short$-$run aggregate supply.

Complete the table by selecting the changes in each scenario necessary to decrease short$-$run aggregate supply.

Change Necessary to Decrease AS

Regulations on the firm

Tax rates

Inflation expectations