0.57142 points See Are (Figure: Income-Expenditure Equilibrium) Use Figure: Income-Expenditure Equilibrium. If planned investment spending increases by $100, the income-expenditure equilibrium occurs at a real GDP of: Planned aggregate spending. And (billions of dollars) $4,000 3,500 3,000 Oa. $8,100. Ob. $4,000. Oc $2,250. Od.$3,600. 2,000 1,000 800 0 45-degree line Al $500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 y+ Real GDP (billions of dollars)