below: Research by a team of expert economists has uncovered the consumption and import functions and produced a forecast of planned investment and exports for the economy of Happydale as reported Real GDP Y Consumption C Investment I Exports X Imports IM 100 100 75 20 100 190 100 75 40 200 280 100 75 55 300 370 100 75 70 400 160 100 75 85 500 550 100 75 100 800 840 100 75 115 700 730 100 75 130 BOO 820 100 75 145 800 910 100 75 160 1,000 1,000 100 75 175 1,100 1,090 100 75 190 1,200 1,180 100 75 205