International Capital Flows: A Role for Demography?
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1 International Capital Flows: A Role for Demography? David Backus, Thomas Cooley, and Espen Henriksen NUS October 12, 2010 This version: October 11, 2010 Backus, Cooley, and Henriksen (NYU) International Capital Flows 1/25
2 Capital inflows: sign of success? Larry Summmers, IMF, October 3, 2004: There is a standard set of things that finance ministers of countries with significant current account deficits say. Perhaps the sharpest formulation is: We live in a country that capital is trying to get into. Would you rather live in a country that capital is trying to get out of? Backus, Cooley, and Henriksen (NYU) International Capital Flows 1/25
3 Capital inflows: portent of peril? Daniel Gross, New York Times, May 8, 2005: [US] imbalances are eerily reminiscent of recent economic crises. Could we see a perfect storm [for the US economy]? If so, what would it look like? Nouriel Roubini estimates that long-term interest rates in the US could rise by 200 basis points over a few months and the value of the dollar would fall. Said Barry Eichengreen: The result would not be a full-blown financial crisis most likely, but it would still be a major recession. Adds Jeffrey Frankel, some of us have been warning of this hard-landing scenario for more than 20 years. Backus, Cooley, and Henriksen (NYU) International Capital Flows 2/25
4 Overview Facts about capital flows Facts about demography Amodel Preliminary results Backus, Cooley, and Henriksen (NYU) International Capital Flows 3/25
5 Facts about capital flows Facts about capital flows What drives them? Business cycles Institutions Taxes and legal restrictions Commodity prices (oil) Political risk Exchange rates Anything that affects saving or investment Some data to get us thinking... Backus, Cooley, and Henriksen (NYU) International Capital Flows 4/25
6 Facts about capital flows Facts: current accounts CA (% of GDP) United States Great Britain Canada France Germany Japan India China Australia Backus, Cooley, and Henriksen (NYU) International Capital Flows 5/25
7 Facts about capital flows Facts: net foreign assets Distribution of Net Foreign Assets Density NFA(% of GDP) Backus, Cooley, and Henriksen (NYU) International Capital Flows 6/25
8 Facts about capital flows Facts: current account spectrum Canada France Italy Japan UK US Cycles Per Quarter Backus, Cooley, and Henriksen (NYU) International Capital Flows 7/25
9 Facts about capital flows Facts: summary Capital flows are persistent Demography inherently persistent, too Could it play a role in capital flows? Backus, Cooley, and Henriksen (NYU) International Capital Flows 8/25
10 Facts about demographics Facts: age distributions Percentage of Total Population United States Japan China Backus, Cooley, and Henriksen (NYU) International Capital Age Flows 9/25
11 Facts about demographics Facts: dependency ratios Dependency Ratios in Major Countries Dependency Ratio(%) United States Europe Japan China India Year Backus, Cooley, and Henriksen (NYU) International Capital Flows 10/25
12 Facts about demographics Facts: fertility Fertility Rates of Major Countries Fertility Rate United S Europe Japan China India Year Backus, Cooley, and Henriksen (NYU) International Capital Flows 11/25
13 Facts about demographics Facts: life expectancy Life Expectancy in Major Countries Life Expectancy at Birth United States Europe Japan China India Year Backus, Cooley, and Henriksen (NYU) International Capital Flows 12/25
14 Facts about demographics Facts: life expectancy Distribution of Life Expectancy (All Countries) Density Backus, Cooley, and Henriksen (NYU) International Capital Flows 13/25
15 Model Model: overview One-good world National production functions Unrestricted international capital flows Overlapping generations Life-cycle saving Fertility, mortality, immigration tied to data Fixed retirement age (65) Result: demographic differences generate capital flows Backus, Cooley, and Henriksen (NYU) International Capital Flows 14/25
16 Model Model: overlapping generations Each country consists of overlapping generations of agents who live up to I periods, with age denoted by i {1,...,I }. At each date, there are I different cohorts alive. Individuals remain children for I0 periods in which they do not work, consume, or save. On reaching adulthood, they do all of these things Fixed retirement age Notation Model includes countries j, agents/cohorts i, datest Agent variables denoted with lower-case letters, country aggregates with upper case Backus, Cooley, and Henriksen (NYU) International Capital Flows 15/25
17 Model Model: demography The demographic structure of the population depends on fertility, mortality and immigration. Survival: the probability of an agent of age i at date t surviving to the next period is s i,t. The unconditional probability of reaching age i is s i = i 1 j=1 s j. Fertility: fertility rates connect the current age distribution to the number of age-1 agents next period. Age distribution: Let x t R I be the vector of number of members in each cohort in period t. Evolution of age distribution: Let m t R I be a vector of immigrants by age. If ˆΓ t contains fertility and survival rates at time t, thelawof motion for the population is x t+1 = ˆΓ t x t + m t. Backus, Cooley, and Henriksen (NYU) International Capital Flows 16/25
18 Model Model: preferences Preferences. An agent born at date t has the additive utility function I E t+i0 β i s i u i (c i,t ), i=i 0 +1 where c i,t is consumption of agent of age i in period t and β i is an age-specific discount factor. Power utility: u (c i,t )= (c i,t) 1 σ 1, 1 σ Backus, Cooley, and Henriksen (NYU) International Capital Flows 17/25
19 Model Model: labor supply Individuals supply one unit of labor inelastically Efficiency units or productivity follow a deterministic function of age. The vector of age specific efficiency units of labor is denoted {ɛ i } I i=1. Childhood and retirement are modeled by setting efficiency equal to zero. Aggregate labor supply in country j is N jt = x it s i t Backus, Cooley, and Henriksen (NYU) International Capital Flows 18/25
20 Model Model: technology Countries produce the same good Country j time t Capital stocks: Y j,t = θ j,t K α j,t N1 α j,t K j,t+1 =(1 δ)k jt + I j,t Backus, Cooley, and Henriksen (NYU) International Capital Flows 19/25
21 Model Model: equilibrium 1 Individuals in each country choose consumption to maximize utility One consequence is the second-order difference equation a i+1,t+1 = a i,t R t + ɛ i w t + h t ( ) 1 1 σ (ai 1,t 1 R t 1 + ɛ i 1 w t 1 + h t 1 a i,t ). βs i 1,t 1 R t Combined with initial and terminal conditions, this uniquely defines the life-cycle saving and consumption sequence for given prices. Firms choose labor and capital to maximize profits: ( ) 1 Kj,t d = rj,t α 1 Nj,t. αθ j,t Backus, Cooley, and Henriksen (NYU) International Capital Flows 20/25
22 Model Model: equilibrium 2 Goods market clears C jt i Y jt = j j c ijt (C jt + I jt ) Asset/capital market clears A jt i A jt = j j a ijt K jt Backus, Cooley, and Henriksen (NYU) International Capital Flows 21/25
23 Model Model: capital flows implied by demography [Coming soon!!] Backus, Cooley, and Henriksen (NYU) International Capital Flows 22/25
24 Model 1. Individuals at all ages in all countries optimize and supply capital (savings) given prices E t+i0 { subject to constraints I i=i 0+1 β i s i u i (c i,t ) c i,t + a t+1,i+1 = a i,t (1 + r t )+ɛ i w t + h i,t, and a 1,t = a I +1,t =0. }, 2. Firms in all countries demand capital and labor given prices (rental and wage rates) 3. Prices are set such that global capital demand equals global capital supply.
25 Calibration Conditional survival propabilities Data Cohort sizes Data Capital s share of output (α) 1/3 Risk aversion / intertemp. subst. (σ) 4 Time-preference parameter (β) Net annual risk-free rate of return of 2.5%. Depreciation rate (δ) 2.5% annually.
26 Numerical experiments 1. Benchmark model countries only differ in terms of demographics 2. TFP differences match relative aggregate GDP across countries 3. Differences in capital wedges match K/Y -ratios
27 NFA/GDP positions, benchmark model NFA/GDP CA DE FR IT JP US GB
28 Relative size of NFA positions, benchmark model NFA position, normalized by the U.S. position CA DE FR IT JP US GB
29 Implied GDP levels relative to the U.S., benchmark model GDP relative to the U.S Model Data M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D M D CA DE FR IT JP GB CA DE FR IT JP GB CA DE FR IT JP GB CA DE FR IT JP GB CA DE FR IT JP GB CA DE FR IT JP GB
30 NFA/GDP positions, TFP set to match relative GDP levels NFA/GDP CA DE FR IT JP US GB
31 Implied relative TFP levels, TFP set to match relative GDP levels TFP (US normalized to 1) CA DE FR IT JP US GB
32 Last thoughts International capital flows revisited An imbalance to be managed or a fact of life to be explained? Persistence is a clue to their origin Demographics both persistent and different across countries A role in international capital movements? Backus, Cooley, and Henriksen (NYU) International Capital Flows 23/25
33 Extra slides US household net worth net worth real estate at market real estate at cost equity Ratio to GDP Year Backus, Cooley, and Henriksen (NYU) International Capital Flows 24/25
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