1. An economy is described by the following equations: C = 2600 + 0.8 (Y + T) − 10 000r I = 2000 − 10 000r P G = 1800 X = M = 0 T = T = 3000 The real interest rate, expressed as a decimal, is 0.10 (i.e. 10%). Find a numerical equation relating planned aggregate expenditure to output. Using a table or other method, solve for short-run equilibrium output. Show your result graphically using a Keynesian cross diagram. LO 10.5 MEDIUM