International Macroeconomics - Session II
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1 International Macroeconomics - Session II Tobias Broer IIES Stockholm Doctoral Program in Economics
2 Acknowledgement This lecture draws partly on lecture notes by Morten Ravn, EUI
3 Key definitions and concepts Obstfeld and Rogoff (2000) Issues: Recap: Last section Intratemporal vs. Intertemporal Trade Risk-sharing via financial assets, or terms of trade Difficult to account for empirical behaviour of exchange rates Models Static vs dynamic Perfect foresight vs. uncertainty N country world vs. small-open economy Puzzles for the simple theory Home bias in trade Lack of intertemporal trade Home bias in financial assets Lack of risk-sharing (Also: ER puzzles)
4 This session: International Business Cycles Focus on dynamic/ short-run effect of shocks, and its transmission to domestic economy and other countries. How are shocks transmitted between countries? How do business cycles comove between countries? Can a 2-country version of the simple neoclassical model, with intertemporal consumption smoothing, capital accumulation, and flexible labour supply account for this? Do equilibrium properties differ across asset market structures? And what role do the terms of trade play?
5 What this session doesn t answer... Why might markets be incomplete? (Treated later.) Why do we observe very persistent LR movements in foreign asset positions and RER? Are frictions in goods trade important? How about rigidities in nominal prices?
6 Learning points Capital accumulation dynamics are crucial for trade dynamics with productivity shocks. Preference shocks work quite well, government expenditure shocks do not. Bond economy surprisingly similar to complete markets, unless shocks are very persistent. Next section: In models with several goods, the elasticity of substitution is crucial for equilibrium dynamics.
7 Roadmap for this section 1. International Business Cycle-Facts 2. The frictionless 2 country real business cycle model and its puzzles 3. Does the model with incomplete markets work better? 4. Next section: Multigood models, terms of trade insurance and the real exchange rate
8 International Business Cycle-Facts
9 Moments of the data Variance and within-country covariance of main macro variables Cross-country correlation Var and Cov of Open economy variables (X,M,CA) Volatility of international variables (RER, ToT), and correlation with others
10 Filtering Isolate business cycle frequencies, and make data stationary Options: Difference, HP- or Band Pass Filter Here: HP filter unless o/wise indicated
11 Business Cycles in OECD countries Source: Baxter 1995
12 Business Cycles in OECD countries Source: Baxter 1995
13 Export and import in OECD countries Source: Ravn 1997
14 Cross-Country Correlations Source: Ravn 1997
15 Real Exchange /8./01/234/56!"#$%&'$()()(')"#!*++$,'$()()('), 998 rates 8:;8 and 8:;88<8 relative 9988=;8 consumption >10.1 C15D8 8?;8 <<;8 8@8 <A8 <=;8 8<8 8= 8: HIJ108 -E G61 HKIE H10/8 99;8 <:8 89;8 :=;88<8 =88 <88 A?8 :8;889 IL108 99;8 8F;88<;8 <@8 9?8 9:8 <<8 <:8 8=8 <:8 <F G61 >10 M 74/8./01/2@9F8;@9?< ;;;;8 998 A@8 = 8:;8 8F8 8=89=8 8B;8 M :?88A8 <=8 A:8 9B8 =?8 <?8 <<8 :<8 <F <? >10 74/8 -./01/2@9?: = 89;8 8F;88F;;;; 1K/KNO< M G61 8 ;;;;8 8:;88<8 8?8998 9?8 @A
16 International Business Cycle-Facts - Summary 1. Business cycles are similar across countries 2. Exports are less pro-cyclical than imports, so the TB is counter-cyclical. 3. Output, employment, investment and consumption are positively correlated across countries. 4. Consumption is less correlated across countries than income. 5. RER volatility is an order of magnitude higher in flexible ER regimes. 6. The correlation between the RER and all real variables, incl. relative consumption, is small.
17 International Business Cycle - Literature and Roadmap One good model with complete markets 1. Backus, Kehoe and Kydland JPE Ravn, JIMF 1997 Incomplete markets: trade in bonds and the importance of persistence 1. Baxter (1995), Baxter and Crucini (1995) Next session: Country-specific traded goods 1. With CM: Backus, Kehoe and Kydland AER With IM: Hethcote and Perri (2000), Corsetti, Dedola and Leduc (2008)
18 A benchmark stochastic 2 country production model
19 A benchmark model: General setup 2 countries of equal size, discrete time Agents: representative infinitely lived agents, competitive firms and a government for each country Single perishable good used for consumption and investment and government consumption Consumers have identical preferences across countries i U i = E 0 β t u(c it, l it ) (1) t=0
20 A benchmark model: Technology, Govmt., Uncertainty Technology CRTS with persistent shocks y i,t = exp(a it k 1 α it nit) α y i,t = exp(a it )k 1 α it nit α where n it = 1 l it,a t = [A 1t, A 2t ] = RA t + ɛ t+1 and ɛ t+1 has var-cov matrix Ω. Note: immobile labour but free trade in goods (and capital). Capital accumulates according to k it+1 = (1 δ)k it + x it Governments finance exogenous spending by lump-sum taxes ln g t+1 = (1 ρ)lng + ρlng t + u it Uncertainty summarised by state of the world s t : s t = {ɛ t, u it }
21 Complete Markets and First WT Complete markets Exploit 1st welfare theorem: With complete markets, competitive equilibrium allocation is solution to appropriate social planner s problem with initial country weights µ 1, µ 2.
22 Social planner s problem max {cit,k it+1,l it }E 0 [ i c it + x it i i µ i β t u(c it, 1 n it )] t=0 subject to exp(a it )F (k it, n it ) g it (2) k it+1 = (1 δ)k it + x it (3) k i0 given (4)
23 s t : 1. c it : µ i u c (c it, 1 n it ) = λ t First order conditions Implies perfect risk sharing - relative marginal utility is constant across states uc(c it,1 n it ) u c(c jt,1 n jt ) = µ j µ i 2. n it : un(c it,1 n it ) u c(c it,1 n it ) = exp(a itf n (k it, n it ) Efficient provision of labour effort requires MRS=MRT state by state in both countries. 3. k it+1 : λ t = E t [βλ t+1 (exp(a it+1 )F k (k it+1, n it+1 ) + 1 δ)] = E t [βλ t+1 (exp(a jt+1 )F k (k jt+1, n jt+1 ) + 1 δ)] Investment equalises expected marginal productivity of capital. 4. So Consumption risks are perfectly shared, while factors are employed according to productivity.
24 Interpretation
25 Consumption risk sharing u c (c it, 1 n it ) u c (c jt, 1 n jt ) = µ j µ i (5) 1. Implies that redistributive shocks (that leave aggregate world variables unchanged) have no impact on allocation. And aggregat e volatility has minimum weighted utility cost. 2. Note that (5) does not imply constant consumption ratios. For c j c i to be constant, need to assume 2.1 Separability of utility in l and c (U c unaffected by l) 2.2 CRRA preferences
26 Effect of technology shocks A 10 > 0 t = 0: Output and labour productivity are increased on impact. So labour (demand) in 1 rises. Persistence implies higher productivity of capital and labour in country 1 in period 1. So capital moves to country 1 - investment increases there, but decreases in 2. Consumption increases from higher WORLD wealth (wealth effect), but decreases from higher investment to build k for tomorrow (substitution effect), both effects are the same in both countries. Increase in relative labour supply in country 1 may change relative consumption.
27 Effect of technology shocks A 10 > 0 t > 0: Make hay while the sun shines in country 1 (BKK) 1. Higher productivity and capital in 1 implies higher labour effort, which may change consumption depending on the cross-elasticity with consumption. 2. Lower capital in 2 implies optimally lower labour supply. Yields strong positive correlation in consumption, negative correlation in investment and hours. No relative wealth effects.
28 Step back: Key elements of the model 1. Capital accumulation: gives chance of countercyclical NX from investment dynamics, as consumption smoothing delivers procyclical NX. 2. Flexible labour supply: increases investment and output response to Prod shocks. 3. Complete markets: Wealth and substitution effects of shocks are shared.
29 Quantitative Results: BKK country version of Kydland and Prescott (1982), no government shocks 2. Introduce 3rd factor: inventories 3. Time to build capital formation: capital adjusts slowly to investment. 4. Time dependence in utility from leisure.
30 Calibration 1. Symmetric world (US plus clone) 2. CD preferences over c, l 3. Parameters chosen to match great ratios (c/y,i/y,labour share) and real interest rate 4. Shocks estimated on US-Europe, symmetricised : SD , correlation 0.258, and AR(1) parameter matrix R=
31 Model Solution and computation 1. Linearisation around symmetric non-stochastic steady state 2. Compute moments from HP-filtered data of 50 sequences of 100 periods
32 Results
33 Moments of the model economy
34 Response to a technology shock
35 Summary 1. Model overstates variability of investment, despite time to build, etc. 2. Backus-Smith puzzle: Cross-country correlation of consumption much larger than of output. 3. Comovement puzzle: Cross-country correlations of output, employment, and investment are negative. 4. Net exports are much more volatile and less counter-cyclical than in the data
36 1. Change preferences to Excursion: Taste shocks U i = E 0 with d c it = ρd d c it + hc it 2. Consumption risk sharing t=0 β t u(d c itc it, l it ) (6) λ t = d c it u c(d it c it, 1 n it ) = d c jt u c(d jt c jt, 1 n jt ) then implies d c it u c(d it c it, 1 n it ) d c jt u c(d jt c jt, 1 n jt ) = µ j µ i (7) Taste shocks lead to fluctuations in relative consumption, lower correlation c i, c j 3. First order condition for labour supply reads u n (d it c it, 1 n it ) d c it u c(d it c it, 1 n it ) = exp(a it)f n (k it, n it ) (8)
37 Taste shocks 1. For simplicity, consider separable log-utility U i = E 0 t=0 2. Consumption risk sharing: c it = dc it d c it c jt β t d c itlogc it + Blog(1 n it ) (10) 3. First order condition for labour supply reads Bc it 1 n it = d it exp(a it F n (k it, n it ) (11) Taste shocks lead to fluctuations in hours, and positive cross-country correlation, since 1 n it 1 n jt = exp(a it)f n (k it, n it ) exp(a jt )F n (k jt, n jt ) (12)
38 Taste shocks 1. Investment is given by 1 = E t [β exp(a it )F k (k it, n it ) d it+1c it d it c it+1 ] (13) So investment falls as price of current consumption is high. 2. Investment is positively correlated across countries since (14) E t [λ t+1 ] = E t [exp(a it )F k (k it, n it )] = E t [exp(a jt )F k (k jt, n jt )](15)
39 Impulse responses
40 So far Complete markets: Imply Perfect risk sharing Backus Smith Cons correlation puzzle 1.2 Efficient allocation of capital and labour Comovement puzzle of negative i/i,n/n correlation. 2. Now: Incomplete Markets: Trade in bonds only. 3. M. Baxter (1995) International Trade and Business Cycles, Hb Int Economics.
41 Environment 1. Preferences and technology as before, but countries only trade in bonds b it that pay interest R r in all states s t. 2. The budget constraint is thus c it + b it+1 + x it + g it R t b it + y it (16) plus no Ponzi condition for bonds. 3. 1st WT no longer holds, so look at competitive equilibrium.
42 Representative HH problem max {cit,n it,b it,k it+1 }E 0 β t u(c it, 1 n it ) (17) t=0 subject to (18) c it + b it+1 + x it + g it R t b it + y it (19) y i,t = exp(a it )k 1 α it n α it (20) k it+1 = (1 δ)k it + x it (21) b i,t Π s tr 1 i,t (y i,s g i,s ) (22) s=t
43 Competitive equilibrium 1. Set of prices R t and allocation {c it, k it, b it, n it, g it },i=1,2 such that 2. Government balances its budget given g t 3. Representative households solve their problem given R t 4. Markets for bonds and capital clear.
44 Intuition: Productivity shocks in a small open economy 1. Small open economy assumption: Country i has no effect on world prices. Take S t to be the subset of world events in history s t. 2. Simplifies, as can abstract from general equilibrium effect on interest rates. 3. Clarifies intuition for difference between complete markets and trade in bonds only.
45 Excursion: Productivity shocks in a small open economy 1. Complete markets βu c (s t+1 ) u ct = q(s t+1) π(s t+1 ) = q(s t+1) π(s t+1 ) (23) 2. So world prices determine MRS in c in all states, and country productivity shocks have no effect on consumption. 3. Asset payoffs offset shocks, so country shocks have no wealth effect.
46 Intuition: Productivity shocks in a small open economy 1. Trade in uncontingent bonds 2. World prices tie down expected MRS. R t+1 βe[u c (s t+1 )] u ct = 1 (24) 3. Given R, agents borrow and lend to smooth consumption. 4. E.g. R = 1/β, quadratic utility: agents consume annuity value of expected wealth. 5. But shocks have wealth effects, so change consumption. 6. Persistence is important: wealth effects stronger for more persistent shocks. 7. With R = 1/β, even transitory shocks have permanent effect on consumption.
47 Baxter (1995): A 2 country model 1. A positive shock to A it has a positive wealth effect but negative substitution effect on consumption and leisure in i. Effect on j wealth depends on spillovers of productivity process. 2. FOC for bonds equalises expected MRS E[ u c(c it+1, 1 n it+1 ) u c (c it, 1 n it ) ] = E[ u c(c jt+1, 1 n jt+1 ) ] (25) u c (c jt, 1 n jt ) 3. FOC for k t+1 makes capital flow to high productivity country E[exp(A it )F k (k it, n it )u c (c it+1, 1 n it+1 )] = E[exp(A jt )F k (k jt, n jt )u c (c jt+1, 1 n jt+1 )] (26)
48 Solution and parameters 1. King Plosser and Rebelo (1987): solve system of log-linear approximations around non-stochastic steady state. 2. Problem: In SS R = 1/β, so transitory shocks have permanent effects on relative wealth, consumption and leisure. 3. Solution: Endogenous discount factor or debt-elastic interest rate to tie variables to steady state value. 4. Log-utility, parameters follow King, Plosser and Rebelo (1988).
49 2 specifications of productivity shocks 1. As in BKK (1992): Correlated transitory shocks with spillovers. 2. Correlated near permanent shocks.
50 Results
51 Impulse responses with BKK shocks Source: Baxter 1995
52 Source: Baxter 1995 Moments with CM and IM
53 Discussion CM and IM almost identical for transitory shocks that spill over to the other country. Only with near-permanent shocks and no spillovers, the two differ, as wealth effects are important. Wealth effects increase consumption at home by more, breaking c, c link, and making imports more procyclical, so NX countercyclical. Comovement puzzle for labour inputs and investment remains.
54 So far Transmission of shocks entirely via financial markets. But how about Real exchange rate movements, and fluctuations in ToT? Need multi-good model. 1. Traded vs. non-traded goods. 2. Country specific traded goods.
55 International Macroeconomics - Session II Tobias Broer IIES Stockholm Doctoral Program in Economics
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