Spending Spending E3 E2 E1 b a Income 2 3 Years (real GDP) In the right-hand diagram above, points a, b, and c are levels of spending implied by spending balance in the left-hand diagram. In addition, these levels of spending are equal to potential GDP in Years 1, 2, and 3. However, actual GDP in Year 3 ends up at point d. What could account for the economy moving to point d in Year 3? Select one: O a. Potential GDP has risen more than expected. O b. The expenditure line has shifted above E3 because of an increase in net exports. O c. Point d represents the effects of the multiplier. O d. The expenditure line has shifted below E3 because of a drop in government purchases