lecture 1 intermediate macroeconomics, autumn 2015 · lecture 1: intermediate macroeconomics,...
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Lecture 1: Intermediate macroeconomics, autumn 2015
Lars Calmfors
Literature: Mankiw, chapters 3 and 6.
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1 Topics
1. The relationship between saving, investment and the interest rate
in a closed economy (the world economy)
2. The relationship between fiscal deficits and the interest rate
3. The relationship between saving, investment and the current
account in an open economy
4. The relationship between the fiscal balance and the current
account in an open economy
5. Trade imbalances in the euro area
6. The current account and the exchange rate
7. Sweden's crisis in the 1990s and the exchange rate depreciation
8. The need for real exchange rate depreciations in the euro area
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A model of a closed economy Y = F(K, L) Production function
K = K Given capital stock
L = L Given labour force
Y = C + I + G Goods market equilibrium
C = C(Y – T) Consumption function
I = I(r) Investment function
G = G Given government expenditure
T = T Given lump sum tax
Goods market equilibrium Y = C(Y −T ) + I (r) + G
G ↑⇒ r ↑⇒ I ↓
Equilibrium in the market for credit (“loanable funds”)
S = Y − C(Y −T ) − G = I (r)
Saving = Investment
S = [𝑌𝑌� − 𝑇𝑇� − 𝐶𝐶(𝑌𝑌� − 𝑇𝑇�)] + [𝑇𝑇� − �̅�𝐺] = 𝐼𝐼(𝑟𝑟)
Private saving + Government saving = Investment
G ↑⇒ r ↑⇒ I ↓
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Terminology
• Government saving = The government's budget balance or the fiscal balance
If > 0, then there is a budget surplus or fiscal surplus
• If < 0, then there is a budget deficit or fiscal deficit
• Sometimes the term government net lending is used to denote the fiscal balance
• Positive government net lending means a fiscal surplus • Negative government net lending means a fiscal deficit
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Figure 3-7: The consumption function 4
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Figure 3-8: The investment function 5
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6 Figure 3-9: Saving, investment and the interest rate
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Figure 3-10: A reduction in saving
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Figure 3-10: Military spending and the interest rate in the United Kingdom 8
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Different interest rates in the real world
• Only one interest rate in the model
• Many interest rates in the real world
- terms - credit risk - tax treatment
• The interest rate in the model is best interpreted as the interest rate on long-term bonds
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Recent and current situation
• Fiscal deficits in many countries
- insufficient fiscal restraint in good times - fall in tax revenues in the financial crisis - support to the financial sector - fiscal stimulus programmes
• High interest rates in countries with solvency problems
• Low interest rates in countries without credibility problems
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Figure 3-11: An Increase in the demand for investment
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Figure 3-12: An increase in investment demand when saving depends on the interest rate
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16 Figure 6-1: Imports and exports as a percentage of output: 2012
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Equilibrium in the open economy 𝑌𝑌 = 𝐶𝐶𝑑𝑑 + 𝐼𝐼𝑑𝑑 + 𝐺𝐺𝑑𝑑 + 𝐸𝐸𝐸𝐸 𝐶𝐶 = 𝐶𝐶𝑑𝑑 + 𝐶𝐶𝑓𝑓 𝐶𝐶𝑑𝑑 = 𝐶𝐶 − 𝐶𝐶𝑓𝑓 𝐼𝐼 = 𝐼𝐼𝑑𝑑 + 𝐼𝐼𝑓𝑓 𝐼𝐼𝑑𝑑 = 𝐼𝐼 − 𝐼𝐼𝑓𝑓 𝐺𝐺 = 𝐺𝐺𝑑𝑑 + 𝐺𝐺𝑓𝑓 𝐺𝐺𝑑𝑑 = 𝐺𝐺 − 𝐺𝐺𝑓𝑓 𝑌𝑌 = ( 𝐶𝐶 − 𝐶𝐶𝑓𝑓 ) + (𝐼𝐼 − 𝐼𝐼𝑓𝑓) + (𝐺𝐺 − 𝐺𝐺𝑓𝑓) + EX 𝑌𝑌 = 𝐶𝐶 + 𝐼𝐼 + 𝐺𝐺 + 𝐸𝐸𝐸𝐸 − (𝐶𝐶𝑓𝑓 + 𝐼𝐼𝑓𝑓 + 𝐺𝐺𝑓𝑓) 𝑌𝑌 = 𝐶𝐶 + 𝐼𝐼 + 𝐺𝐺 + 𝐸𝐸𝐸𝐸 − 𝐼𝐼𝐼𝐼 𝑌𝑌 = 𝐶𝐶 + 𝐼𝐼 + 𝐺𝐺 + 𝑁𝑁𝐸𝐸
IM
NX
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Equilibrium in the open economy, cont.
𝑁𝑁𝐸𝐸 = 𝑌𝑌 − (𝐶𝐶 + 𝐼𝐼 + 𝐺𝐺)
Net Exports = Output – Domestic Spending
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BNP-andelar
Procent av BNP, löpande priser
50 10
40 8
30 6
20 4
10 00 02
04 06 08
2 10 12 14 16
Hushållens konsumtion Offentlig konsumtion Fasta bruttoinvesteringar Nettoexport (höger)
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Saving-investment balance in an open economy
Y = C + I + G + NX
Y - C - G = I + NX
S = I + NX
Saving can be of two forms: physical accumulation of real
capital (I) or accumulation of financial claims on the rest of the
world resulting from net exports (NX).
S – I = NX • Net exports are the difference between saving and investment.
• Net exports = trade balance
• Saving minus investment = net capital outflow (net foreign
investment) = Net exports = Trade balance
• Net capital outflow can take many forms
- lending to foreign banks
- purchases of foreign bonds
- purchases of foreign assets (equity, real estate)
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Table 6-1: International Flows of Goods and Capital: Summary
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22 Figure 6-6: The trade balance, saving, and investment: The U.S. Experience
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A model of a small open economy
r = r *
Y = Y = F (K , L)
C = C(Y −T )
I = I (r)
NX = (Y −C −G) − I = S − I
Reduced form NX = Y − C(Y − T) − G − I(r*)
NX = S− I(r*)
Net export equals the difference between saving and investment
at the given world market real rate of interest
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Figure 6-2: Saving and investment in a small open economy
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Figure 6-3: A fiscal expansion at home in a small open economy
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Figure 6-4: A fiscal expansion abroad in a small open economy
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Figure 6-5: A shift in the investment schedule in a small open economy
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Current account balance = Net exports + Net return on foreign assets CA = NX + r · NFA
CA = current account balance
NX = net exports
r = interest rate
NFA = net foreign assets = foreign assets - foreign debt
Mankiw simplifies the analysis by neglecting the net return on foreign assets. In most advanced economies NFA ≈ 0. Germany is an exception; NFA ≈ 50 per cent of national income (GDP – depreciation of capital). In Great Britain (with colonial empire) before World War I, NFA was twice the size of national income. Hence NFA added approximately 2 × 0.05 = 10 per cent to national income. In France (also with colonial empire) before World War I, NFA was about the size of national income. Hence NFA added approximately 5 per cent to national income.
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Current account balances 2005-2010 Luxembourg Netherlands
Germany Austria Finland
Belgium France
Italy Slovenia
Ireland Slovakia
Malta Estonia
Spain Cyprus
Portugal Greece
% of GDP
‐10.3 ‐10.8
‐11.7
‐6.7 ‐7.4
‐7.6
‐5.3
‐1.2 ‐2.0
‐3.1 ‐3.5
0.6
3.2
3.0
6.4
6.1
8.4
‐15 ‐10 ‐5 0 5 10
Source: Eurostat, Ifo Institute calculations.
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x
The real exchange rate
Real exchange rate = the relative price between domestic and foreign goods p = price of domestic (Swedish) output in domestic currency (SEK)
price of foreign (US) output in foreign currency
The price of output in a country is called the GDP deflator
Real exchange rate = nominal exchange rate ($/SEK) Swedish output price (SEK) / foreign output price ($)
ε = e × (p/p*)
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Relative rates of change 30
Percentage change of a ratio Percentage change of numerator - Percentage change of denominator (if small changes)
- If z , then
Percentage change of a product Percentage change of factor 1 + Percentage change of factor 2 (if small changes)
- If z =xy
Hence if then:
Percentage change in real exchange rate ≈ percentage change in nominal exchange rate +
percentage change in Swedish output price – percentage change in foreign output price
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The real exchange rate, cont.
ε↑ ⇔ real appreciation (the relative price of domestic goods increases)
ε↓ ⇔ real depreciation (the relative price of domestic goods falls)
NX = NX(ε) ε↑ ⇒ NX↓ Net export is negatively related to the real exchange rate (the relative price of domestic goods)
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Figure 6-7: Net exports and the real exchange rate
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Figure 6-8: How the real exchange rate is determined
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Figure 6-9: The impact of expansionary fiscal policy at home on the real exchange rate
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Figure 6-10: The impact of expansionary fiscal policy abroad on the real exchange rate
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Figure 6-11 The impact of an increase in investment demand on the real exchange rate
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Elimination of current account deficits
• This requires a real exchange rate depreciation
• Sweden had large current account deficits in the late 1980s before the 1990s crisis
• These deficits were eliminated through a large nominal - and real - exchange rate depreciation in
1992 when the fixed exchange rate was abandoned and the krona was allowed to float
• Large increases in net exports in subsequent years
At the same time large fiscal deficits were turned into surpluses
• Greece, Portugal, Ireland, Spain and Italy all have had current account deficits after large real
exchange rate appreciations
• But real exchange rate depreciations are difficult to achieve within the eurozone where there are
no longer any nominal exchange rates between countries
• Instead lower inflation (price and wage cuts) are required in crisis countries and higher inflation
in Germany and other surplus countries
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ULC = unit labour cost = the labour cost of producing one unit of output ULC = 𝑊𝑊𝑊𝑊𝑌𝑌
wage
employment
output
Instead of
RULC = ULC
ULC *
* one often uses relative unit labour costs, RULC, as a measure of the real exchange rate:
the nominal exchange rate
ULC = domestic unit labour cost
ULC* = foreign unit labour cost
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Nominal exchange rate and relative unit labour costs vis-à-vis EU-15 for Sweden
130
120
Index: 1985=100 relative unit labour costs in national currencies
110
100
90
relative unit labour costs in common currency
80
70
Nominal effective exchange rate
60
Sources: Ameco and own calculations.
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Fiscal consolidation, GDP growth and change in net exports in Sweden, 1993-2000
% 5
4
3
2
1
0
‐1
Real GDP growth ‐2 Change in net exports relative to preceding year's GDP
Change in general government net lending, in % of GDP ‐3
1993 1994 1995 1996 1997 1998 1999 2000
Sources: Ameco and own calculations.
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General government net lending in Sweden and the euro area
4 % of GDP Sweden
0
‐4 EU-8
‐8
‐12
Note: EU-8 is a weighted average for Austria, Belgium, Finland, France, (West) Germany, Italy, the Netherlands and Portugal. Sources: OECD Economic Outlook No. 89 (Sweden); and Ameco and own calculations (EU-8).
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43 Figure 9 in Sinn, Hans-Werner, "The Greek Tragedy", CESifo Forum Special Issue 2015 (June)
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The primary fiscal balance is government revenue minus government expenditure excluding interest payments.