Monetary Macroeconomics Lecture 5. Mark Hayes
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1 Diploma Macro Paper 2 Monetary Macroeconomics Lecture 5 Aggregate demand: external trade Mark Hayes slide 1
2 Exogenous: M, G, T, i, π e Goods market KX and IS (Y, C, I) Money market (LM) (i, Y) Labour market (P, Y) AS IS-LM (i, Y, C, I) AD Phillips Curve (,u) AD-AS (P, i, Y, C, I) Foreign exchange market (NX, e) IS-LM (e, Y, C, NX) AD AD-AS (P, e, Y, C, NX)
3 E C I G ( X Z) c (1 t z Y A ) 1 1
4 Summary of policy effects in the Mundell-Fleming model type of exchange rate regime: floating fixed impact on: Policy Y e NX Y e NX fiscal expansion mon. expansion trade policy
5 Chart 2.13 UK current account (a) Includes compensation of employees.
6 Chart 1.5 Sterling exchange rates
7 Real and nominal exchange rates In Mankiw, nominal exchange rate is relative price of domestic currency ( indirect measure) e m f m d real exchange rate is relative price of domestic goods (terms of trade) 7
8 The net exports function The net exports function represents an inverse relationship between NX and ε : NX = NX(ε ) CHAPTER 5 The Open Economy 8
9 The NX curve ε When ε is relatively low, domestic goods are relatively inexpensive ε 1 CHAPTER 5 The Open Economy so net exports will be high NX (ε) 0 NX(ε NX 1 ) 9
10 The NX curve ε ε 2 At high enough values of ε, domestic goods become so expensive that we export less than we import NX(ε 2 ) NX (ε) 0 NX CHAPTER 5 The Open Economy 10
11 The Mundell-Fleming model IS-LM - a simplified version of Robert Mundell and Marcus Fleming (1962) ABSOLUTELY KEY ASSUMPTION: Small open economy with perfect capital mobility. i = i Goods market equilibrium the IS curve: NB: NX(e) not NX(ε) 11
12 The IS curve: Goods market eq m The IS curve is drawn for a given value of i. e Intuition for the slope: e NX Y IS Y 12
13 The LM curve: Money market eq m The LM curve: is drawn for a given value of i. is vertical because: given i, there is only one value of Y that equates money demand with supply, regardless of e. e LM Y 13
14 Equilibrium in the Mundell-Fleming model e LM equilibrium exchange rate equilibrium level of income IS Y 14
15 Floating & fixed exchange rates In a system of floating exchange rates, e is allowed to fluctuate in order to clear the foreign exchange market. In contrast, under fixed exchange rates, the central bank trades its domestic for foreign currency to peg the exchange rate and makes the market. Next, policy analysis first, in a floating exchange rate system then, in a fixed exchange rate system 15
16 Fiscal policy under floating exchange rates At any given value of e, a fiscal expansion increases Y, shifting IS to the right. Results: e > 0, Y = 0 e 2 e 1 e LM1 Y 1 IS 2 IS 1 Y 16
17 Lessons about fiscal policy In a small open economy with perfect capital mobility, fiscal policy cannot affect real GDP. Crowding out closed economy: Fiscal policy crowds out investment by causing the interest rate to rise. small open economy: Fiscal policy crowds out net exports by causing the exchange rate to appreciate. 100%! 17
18 Monetary policy under floating exchange rates An increase in M shifts LM right because Y must rise to restore eq m in the money market. Results: e < 0, Y > 0 e 1 e 2 e LM Y 1 1 LM Y 2 2 IS 1 Y 18
19 Lessons about monetary policy Monetary policy affects output by affecting the components of aggregate demand: closed economy: M i I Y small open economy: M e NX Y 19
20 Trade policy under floating exchange rates At any given value of e, a tariff or quota reduces imports, increases NX, and shifts IS to the right. Results: e > 0, Y = 0 e 2 e 1 e LM1 Y 1 IS 2 IS 1 Y 20
21 Lessons about trade policy Import restrictions under floating rates cannot reduce a trade deficit. Even though NX is unchanged, there is less trade: the trade restriction reduces imports. the exchange rate appreciation reduces exports. Less trade means fewer gains from trade No increase in income or total employment. 21
22 Fixed exchange rates Under fixed exchange rates, the central bank stands ready to buy or sell the domestic currency for foreign currency at a predetermined rate. In the Mundell-Fleming model, the central bank shifts the LM curve as required to keep e at its preannounced rate. This system fixes the nominal exchange rate. When prices are flexible, the real exchange rate can move even if the nominal rate is fixed. 22
23 Fiscal policy under fixed exchange rates Under floating rates, a fiscal expansion would raise e. Under floating rates, fiscal policy is ineffective at changing output. To Under keep fixed e from rates, rising, the fiscal central policy bank is very must sell effective domestic at changing currency, which output. increases M and shifts LM right. Results: e = 0, Y > 0 e 1 e LM Y 1 1 LM Y 2 2 IS 2 IS 1 Y 23
24 Monetary policy under fixed exchange rates An Under increase floating M rates, would shift monetary LM right policy and is reduce e. To very prevent effective the fall at in e, the changing central output. bank must buy Under domestic fixed rates, currency, which monetary reduces policy M and cannot shifts be used LM to back affect left. output. e 1 e LM LM 1 2 Results: e = 0, Y = 0 Y 1 IS 1 Y 24
25 Trade policy under fixed exchange rates A restriction on imports puts upward pressure on e. Under floating rates, To keep e from rising, import restrictions do the not central affect bank Y or must NX. sell domestic currency, Under fixed rates, which increases M import restrictions increase and shifts Y LM and NX. right. Results: e = 0, Y > 0 Y 1 Y 2 e 1 e LM 1 LM 2 IS 2 IS 1 Y 25
26 Summary of policy effects in the Mundell-Fleming model type of exchange rate regime: floating fixed impact on: Policy Y e NX Y e NX fiscal expansion mon. expansion trade policy
27 Summary of policy effects in the Mundell-Fleming model (extended) type of exchange rate regime: floating fixed impact on: Policy Y e NX Y e NX fiscal expansion 0 0 mon. expansion trade policy
28 The Policy Trilemma A nation cannot have free capital flows, independent monetary policy, and a fixed exchange rate simultaneously. A nation must choose one side of this triangle and give up the opposite corner. Independent monetary policy Option 1 (U.K.) Free capital flows Option 3 (China) Option 2 (Hong Kong, Eurozone member) Fixed exchange rate 28
29 Next time Tie up IS-LM with AD curve Consider aggregate supply (AS) Tie AD and AS together to complete the model slide 29
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