Trade Theory with Numbers: Quantifying the Welfare Consequences of Globalization
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1 Trade Theory with Numbers: Quantifying the Welfare Consequences of Globalization Andrés Rodríguez-Clare (UC Berkeley and NBER) September 29, 2012
2 The Armington Model
3 The Armington Model CES preferences: This implies that U j = ( ) σ/(σ 1) Q (σ 1)/σ ij, σ > 1 i X ij = P1 σ ij k P 1 σ kj }{{} λ ij Y j }{{} total income
4 The Armington Model If wages are w i and (iceberg) trade costs are τ ij, then P ij = w i τ ij, so X ij = (w i τ ij ) 1 σ k (w k τ kj ) 1 σ Y j This is the Gravity Equation for the Armington model. We refer to σ 1 as the trade elasticity. Technically, d ln X ij /X jj d ln τ ij = σ 1
5 Armington: Trade and Welfare The expenditure function with CES preferences is e(p 1, P 2,..., P N, U) = ( i P 1 σ i ) 1/(1 σ) } {{ } P = "price index" U Expenditure per capita in country j is Y j /L j = w j, hence w j = P j U j and so U j = w j /P j. We can think of this as "real income in country j" We want to know how changes in trade costs affect w j /P j
6 Armington: Trade and Welfare Come back to Let Since P ij = w i τ ij and P 1 σ j λ ij = X ij = λ ij P1 σ ij k P 1 σ kj Y j X ij k X kj = X ij Y j = k P 1 σ kj P1 σ ij k P 1 σ kj then = (w i τ ij ) 1 σ P 1 σ j
7 Armington: Trade and Welfare So we have Since τ jj = 1, then λ ij = (w i τ ij ) 1 σ P 1 σ j λ jj = w j 1 σ Pj 1 σ = ( ) 1 σ wj P j Finally, U j = w j = λ 1/(1 σ) jj P j
8 Armington: Gains from Trade How bad would it be to shut down trade? In autarky have λ jj = 1, hence U A j /U j = λ 1/(σ 1) jj Define gains from trade as GT j 1 U A j /U j = 1 λ 1/(σ 1) jj Note that ε σ 1 is the trade elasticity, so can write GT j = 1 λ 1/ε jj
9 Armington: Gains from Trade To implement GT j = 1 λ 1/ε jj, need to measure λ jj and need an estimate of ε
10 Armington: Gains from Trade To implement GT j = 1 λ 1/ε jj, need to measure λ jj and need an estimate of ε λ jj is share of gross expenditure devoted to home purchases, computed from OECD-STAN as gross production - exports gross expenditure
11 Armington: Gains from Trade To implement GT j = 1 λ 1/ε jj, need to measure λ jj and need an estimate of ε λ jj is share of gross expenditure devoted to home purchases, computed from OECD-STAN as gross production - exports gross expenditure To estimate ε, return to gravity equation, X ij = (w i τ ij ) ε Pj ε Y j Taking logs, we have ln X ij = ε ln w i + ln ( Y j Pj ε ) ε ln τij If we had data for τ ij, then can run OLS regression of ln X ij on ln τ ij with exporter and importer dummies to estimate ε
12 Armington: Gains from Trade To implement GT j = 1 λ 1/ε jj, need to measure λ jj and need an estimate of ε λ jj is share of gross expenditure devoted to home purchases, computed from OECD-STAN as gross production - exports gross expenditure To estimate ε, return to gravity equation, X ij = (w i τ ij ) ε Pj ε Y j Taking logs, we have ln X ij = ε ln w i + ln ( Y j Pj ε ) ε ln τij If we had data for τ ij, then can run OLS regression of ln X ij on ln τ ij with exporter and importer dummies to estimate ε A central estimate of ε is 5
13 Armington: Gains from Trade We have ln X ij = ε ln w i + ln ( Y j Pj ε ) ε ln τij + ξ ij
14 Armington: Gains from Trade We have How do we measure τ ij? ln X ij = ε ln w i + ln ( Y j Pj ε ) ε ln τij + ξ ij
15 Armington: Gains from Trade We have How do we measure τ ij? Tariffs ln X ij = ε ln w i + ln ( Y j Pj ε ) ε ln τij + ξ ij
16 Armington: Gains from Trade We have How do we measure τ ij? Tariffs Price differences ln X ij = ε ln w i + ln ( Y j Pj ε ) ε ln τij + ξ ij
17 Armington: Gains from Trade We have How do we measure τ ij? Tariffs Price differences A central estimate of ε is 5 ln X ij = ε ln w i + ln ( Y j Pj ε ) ε ln τij + ξ ij
18 Armington: Gains from Trade λ jj % GT j Canada Denmark France Portugal Slovakia U.S
19 Armington: Counterfactuals More generally, us implies that (notation ˆx = x /x) U j = w j = λ 1/ε jj P j Û j = λ 1/ε jj
20 Armington: Counterfactuals More generally, us implies that (notation ˆx = x /x) U j = w j = λ 1/ε jj P j Û j = λ 1/ε jj For ex-ante analysis, need to predict ˆλ jj
21 Armington: Counterfactuals More generally, us implies that (notation ˆx = x /x) U j = w j = λ 1/ε jj P j Û j = λ 1/ε jj For ex-ante analysis, need to predict ˆλ jj Two approaches
22 Armington: Counterfactuals More generally, us implies that (notation ˆx = x /x) U j = w j = λ 1/ε jj P j Û j = λ 1/ε jj For ex-ante analysis, need to predict ˆλ jj Two approaches Diffi cult: calibrate model and simulate counterfactual
23 Armington: Counterfactuals More generally, us implies that (notation ˆx = x /x) U j = w j = λ 1/ε jj P j Û j = λ 1/ε jj For ex-ante analysis, need to predict ˆλ jj Two approaches Diffi cult: calibrate model and simulate counterfactual Easy: use data { λ ij, Y j }, ε and { ˆτij } to get implied ˆλ jj
24 Cheese, really?
25 Cheese, really? What about comparative advantage? (Ricardo, Eaton-Kortum)
26 Cheese, really? What about comparative advantage? (Ricardo, Eaton-Kortum) Variety gains? (Krugman)
27 Cheese, really? What about comparative advantage? (Ricardo, Eaton-Kortum) Variety gains? (Krugman) Selection/reallocation effects? (Melitz)
28 Cheese, really? What about comparative advantage? (Ricardo, Eaton-Kortum) Variety gains? (Krugman) Selection/reallocation effects? (Melitz) Pro-competitive effects? (Melitz-Ottaviano)
29 Comparative Advantage (Ricardo, Eaton-Kortum) Another reason to trade beyond cheese: specialization according to comparative advantage
30 Comparative Advantage (Ricardo, Eaton-Kortum) Another reason to trade beyond cheese: specialization according to comparative advantage In Ricardian theory, comparative advantage arises because of differences in technology
31 Comparative Advantage (Ricardo, Eaton-Kortum) Another reason to trade beyond cheese: specialization according to comparative advantage In Ricardian theory, comparative advantage arises because of differences in technology Cheese + Ricardo?
32 Comparative Advantage (Ricardo, Eaton-Kortum) Trade elasticity now comes from productivity rather than preferences (ε = θ rather than ε = σ 1)
33 Comparative Advantage (Ricardo, Eaton-Kortum) Trade elasticity now comes from productivity rather than preferences (ε = θ rather than ε = σ 1) But welfare implications of an international shock are still Ŵ j = λ 1/ε jj
34 Comparative Advantage (Ricardo, Eaton-Kortum) Trade elasticity now comes from productivity rather than preferences (ε = θ rather than ε = σ 1) But welfare implications of an international shock are still Ŵ j = λ 1/ε jj Given same data {λ ij, Y j }, same ε, and same shock { ˆτ ij }, then same ˆλ jj and same Ŵ j
35 Increasing Returns with Differentiated Goods (Krugman) In principle, gains from increasing returns and more variety
36 Increasing Returns with Differentiated Goods (Krugman) In principle, gains from increasing returns and more variety In practice, with CES preferences, both variety and scale unchanged
37 Increasing Returns with Differentiated Goods (Krugman) In principle, gains from increasing returns and more variety In practice, with CES preferences, both variety and scale unchanged Gains arise from cheaper foreign goods, just as in Armington
38 Increasing Returns with Differentiated Goods (Krugman) In principle, gains from increasing returns and more variety In practice, with CES preferences, both variety and scale unchanged Gains arise from cheaper foreign goods, just as in Armington Gravity and gains as in the Armington model
39 Reallocation Effects (Melitz) Fixed exporting costs > only highly productive firms export
40 Reallocation Effects (Melitz) Fixed exporting costs > only highly productive firms export Trade > reallocation of labor from low to high productivity firms
41 Reallocation Effects (Melitz) Fixed exporting costs > only highly productive firms export Trade > reallocation of labor from low to high productivity firms Trade > higher average effi ciency
42 Reallocation Effects (Melitz) Fixed exporting costs > only highly productive firms export Trade > reallocation of labor from low to high productivity firms Trade > higher average effi ciency But what about welfare?
43 Reallocation Effects (Melitz) Fixed exporting costs > only highly productive firms export Trade > reallocation of labor from low to high productivity firms Trade > higher average effi ciency But what about welfare? First problem: in Melitz, heterogeneity in productivity, but same VMPL across firms
44 Reallocation Effects (Melitz) Fixed exporting costs > only highly productive firms export Trade > reallocation of labor from low to high productivity firms Trade > higher average effi ciency But what about welfare? First problem: in Melitz, heterogeneity in productivity, but same VMPL across firms Second problem: exit of low productivity firms entails a loss of variety
45 Reallocation Effects (Melitz) Fixed exporting costs > only highly productive firms export Trade > reallocation of labor from low to high productivity firms Trade > higher average effi ciency But what about welfare? First problem: in Melitz, heterogeneity in productivity, but same VMPL across firms Second problem: exit of low productivity firms entails a loss of variety Bottom line: Melitz model (with Pareto) leads to same formula, Ŵ j = λ 1/ε jj
46 Pro-competitive Effects? Key idea: stronger competition weakens domestic monopolies, improving effi ciency
47 Pro-competitive Effects? Key idea: stronger competition weakens domestic monopolies, improving effi ciency But: lower tariffs allow foreign monopolists to increase their markups
48 Pro-competitive Effects? Key idea: stronger competition weakens domestic monopolies, improving effi ciency But: lower tariffs allow foreign monopolists to increase their markups Which effect dominates? It depends on the model
49 Pro-competitive Effects? Key idea: stronger competition weakens domestic monopolies, improving effi ciency But: lower tariffs allow foreign monopolists to increase their markups Which effect dominates? It depends on the model Edmon-Midrigan-Xu drop MC and use Cournot competition
50 Pro-competitive Effects? Key idea: stronger competition weakens domestic monopolies, improving effi ciency But: lower tariffs allow foreign monopolists to increase their markups Which effect dominates? It depends on the model Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data
51 Pro-competitive Effects? Key idea: stronger competition weakens domestic monopolies, improving effi ciency But: lower tariffs allow foreign monopolists to increase their markups Which effect dominates? It depends on the model Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data There can be large pro-competitive effects of trade through destruction of monopolies
52 Pro-competitive Effects? Key idea: stronger competition weakens domestic monopolies, improving effi ciency But: lower tariffs allow foreign monopolists to increase their markups Which effect dominates? It depends on the model Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data There can be large pro-competitive effects of trade through destruction of monopolies Formally, trade reduces dispersion in markups
53 Pro-competitive Effects? Key idea: stronger competition weakens domestic monopolies, improving effi ciency But: lower tariffs allow foreign monopolists to increase their markups Which effect dominates? It depends on the model Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data There can be large pro-competitive effects of trade through destruction of monopolies Formally, trade reduces dispersion in markups But this happens only when economy is close to autarky
54 Pro-competitive Effects? Key idea: stronger competition weakens domestic monopolies, improving effi ciency But: lower tariffs allow foreign monopolists to increase their markups Which effect dominates? It depends on the model Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data There can be large pro-competitive effects of trade through destruction of monopolies Formally, trade reduces dispersion in markups But this happens only when economy is close to autarky For open economies, effects are small
55 Pro-competitive Effects? Two ways to go: drop MC or drop CES
56 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition
57 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data
58 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data There can be large pro-competitive effects of trade through destruction of monopolies
59 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data There can be large pro-competitive effects of trade through destruction of monopolies Formally, trade reduces dispersion in markups
60 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data There can be large pro-competitive effects of trade through destruction of monopolies Formally, trade reduces dispersion in markups But this happens only when economy is close to autarky
61 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Calibrate to Taiwanese firm-level data There can be large pro-competitive effects of trade through destruction of monopolies Formally, trade reduces dispersion in markups But this happens only when economy is close to autarky For open economies, effects are small
62 Pro-competitive Effects? Two ways to go: drop MC or drop CES
63 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition
64 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Arkolakis, Costinot, Donaldson and RC drop CES but keep Pareto (to get gravity)
65 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Arkolakis, Costinot, Donaldson and RC drop CES but keep Pareto (to get gravity) Markup distribution not affected: incumbents lower markups, but low markup firms leave
66 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Arkolakis, Costinot, Donaldson and RC drop CES but keep Pareto (to get gravity) Markup distribution not affected: incumbents lower markups, but low markup firms leave Non-homothetic preferences imply that a decline in trade costs reallocates demand towards low markup goods
67 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Arkolakis, Costinot, Donaldson and RC drop CES but keep Pareto (to get gravity) Markup distribution not affected: incumbents lower markups, but low markup firms leave Non-homothetic preferences imply that a decline in trade costs reallocates demand towards low markup goods Pro-competitive effects actually lower gains from trade
68 Pro-competitive Effects? Two ways to go: drop MC or drop CES Edmon-Midrigan-Xu drop MC and use Cournot competition Arkolakis, Costinot, Donaldson and RC drop CES but keep Pareto (to get gravity) Markup distribution not affected: incumbents lower markups, but low markup firms leave Non-homothetic preferences imply that a decline in trade costs reallocates demand towards low markup goods Pro-competitive effects actually lower gains from trade Effect is very small
69 Back to Armington 1. Add multiple sectors 2. Add traded intermediates
70 Multiple sectors, GT Upper level EoS ρ and lower level EoS ε s Recall gains for Canada of 2.7%. Now gains can be much higher: ρ = 1 implies GT = 8%
71 Multiple sectors, GT, role of upper level EoS
72 Tradable intermediates, GT Set ρ = 1, add tradable intermediates with Input-Output structure Labor shares are 1 α j,s and input shares are α j,ks ( k α j,ks = α j,s )
73 Tradable intermediates, GT % GT j % GT MS j % GT IO j Canada Denmark France Portugal U.S
74 Combination of micro and macro features In Krugman, free entry leads to scale effects associated with total sales
75 Combination of micro and macro features In Krugman, free entry leads to scale effects associated with total sales In Melitz, additional scale effects associated with market size
76 Combination of micro and macro features In Krugman, free entry leads to scale effects associated with total sales In Melitz, additional scale effects associated with market size In both models, trade may affect entry and fixed costs
77 Combination of micro and macro features In Krugman, free entry leads to scale effects associated with total sales In Melitz, additional scale effects associated with market size In both models, trade may affect entry and fixed costs All these effects do not play a role in the one sector model
78 Combination of micro and macro features In Krugman, free entry leads to scale effects associated with total sales In Melitz, additional scale effects associated with market size In both models, trade may affect entry and fixed costs All these effects do not play a role in the one sector model With multiple sectors and traded intermediates, these effects come back
79 Gains from Trade... Canada China Germany New Zealand US Aggregate
80 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC
81 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC Key: Cobb-Douglas preferences
82 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC
83 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC Key: scale effects linked to entry and L.O.V., compositional effect
84 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC MS, IO, PC
85 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC MS, IO, PC Key: IO loops and interdependencies
86 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC MS, IO, PC MS, IO(k), PC
87 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC MS, IO, PC MS, IO(k), PC Key: further amplification through trade in capital goods
88 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC MS, IO, PC MS, IO(k), PC MS, IO, MC, η s =
89 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC MS, IO, PC MS, IO(k), PC MS, IO, MC, η s = Key: trade expands markets relative to entry cost > entry
90 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC MS, IO, PC MS, IO(k), PC MS, IO, MC, η s = MS, IO, MC, η s =
91 Gains from Trade... Canada China Germany New Zealand US Aggregate MS, PC MS, MC MS, IO, PC MS, IO(k), PC MS, IO, MC, η s = MS, IO, MC, η s =
92 From GT to trade policy evaluation Back to {λ ij, Y j }, ε and { ˆτ ij } to get implied ˆλ jj
93 From GT to trade policy evaluation Back to {λ ij, Y j }, ε and { ˆτ ij } to get implied ˆλ jj This is what CGE exercises do
94 From GT to trade policy evaluation Back to {λ ij, Y j }, ε and { ˆτ ij } to get implied ˆλ jj This is what CGE exercises do Contribution here:
95 From GT to trade policy evaluation Back to {λ ij, Y j }, ε and { ˆτ ij } to get implied ˆλ jj This is what CGE exercises do Contribution here: Link to theory "mid-sized models"
96 From GT to trade policy evaluation Back to {λ ij, Y j }, ε and { ˆτ ij } to get implied ˆλ jj This is what CGE exercises do Contribution here: Link to theory "mid-sized models" Model consistent estimation
97 From GT to trade policy evaluation Back to {λ ij, Y j }, ε and { ˆτ ij } to get implied ˆλ jj This is what CGE exercises do Contribution here: Link to theory "mid-sized models" Model consistent estimation Quantify mechanisms
98 Fit of model Research agenda
99 Research agenda Fit of model Elasticities
100 Research agenda Fit of model Elasticities Scale Effects
101 Final Thoughts Complementarities between trade and MP/diffusion can increase GT
102 Final Thoughts Complementarities between trade and MP/diffusion can increase GT Gains from openness (including MP, diffusion) can be much larger
103 Final Thoughts Complementarities between trade and MP/diffusion can increase GT Gains from openness (including MP, diffusion) can be much larger How can small countries be rich?
104 Final Thoughts Complementarities between trade and MP/diffusion can increase GT Gains from openness (including MP, diffusion) can be much larger How can small countries be rich? Gains from openness + domestic frictions
105 Final Thoughts Complementarities between trade and MP/diffusion can increase GT Gains from openness (including MP, diffusion) can be much larger How can small countries be rich? Gains from openness + domestic frictions Scale economies = y DNK /y US = 1/3
106 Final Thoughts Complementarities between trade and MP/diffusion can increase GT Gains from openness (including MP, diffusion) can be much larger How can small countries be rich? Gains from openness + domestic frictions Scale economies = y DNK /y US = 1/3 Domestic frictions bring this to 2/3
107 Final Thoughts Complementarities between trade and MP/diffusion can increase GT Gains from openness (including MP, diffusion) can be much larger How can small countries be rich? Gains from openness + domestic frictions Scale economies = y DNK /y US = 1/3 Domestic frictions bring this to 2/3 Relative GO are then 3/2
108 Final Thoughts Complementarities between trade and MP/diffusion can increase GT Gains from openness (including MP, diffusion) can be much larger How can small countries be rich? Gains from openness + domestic frictions Scale economies = y DNK /y US = 1/3 Domestic frictions bring this to 2/3 Relative GO are then 3/2 If GO US = 5% (twice GT) then GO DNK 50%
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