The document provides information about an open economy model with equations for consumption (C), investment (I), disposable income (Yd), government spending (G), taxes (T), money supply (M/P), and the interest rate (i). It asks to: 1) Derive the IS and LM curves from the model. 2) Find the equilibrium output and interest rate, and the values of C and I at equilibrium. 3) Explain how an expansionary monetary policy that increases M/P affects the equilibrium. 4) Explain how a contractionary fiscal policy that decreases G affects the equilibrium. The key results are: - IS: Y = (910