In the diagram, S and S1 show the supply curves for an agricultural product in years 1 and 2 respectively. D is the demand curve for years 1 and 2. In year 1, the government bought the quantity needed to keep the price at OP. The price remains at OP in year 2. By how much does the government need to increase its purchases in year 2 compared with year 1?
- AWX
- BXY
- CXZ
- DYZ