期刊-NBER美国国民经济研究局-2016number1_19页_2mb

NBER Reporter Summary: 2016 Number 1

Core Content

The NBER Reporter for 2016 Number 1 provides an overview of the research conducted by the International Trade and Investment (ITI) Program. It highlights several key areas of study, including the impact of Chinese exports, global supply chains, wage inequality, trade costs, and the gravity equation. The report also touches on the welfare effects of trade and the role of tariffs in shaping trade outcomes.

Main Topics and Findings

1. The China Shock

• Impact on U.S. Manufacturing: The surge in Chinese imports has significantly affected U.S. manufacturing employment, leading to job losses and wage reductions. Studies by Pierce and Schott, and Handley and Limão, show that this impact is comparable to the gains from new imports in the previous decade.
• Consumer Benefits: Despite the negative effects on employment, Chinese imports have also brought substantial consumer benefits, with welfare gains estimated at 0.2% in the short run and 6.7% in the long run.
• Regional Effects: The effects of the China shock are heterogeneous across regions, with some areas experiencing stronger labor market dislocations than others, but overall, most regions see net benefits.

2. Global Supply Chains and Wage Inequality

• Multinational Firms: Research on multinational firms, global sourcing, and wage inequality explores how firms integrate suppliers across different stages of production.
• Modeling Offshoring: Antras, Fort, and Tintelnot develop a method to analyze the outsourcing decision as a continuous choice rather than a discrete one, and apply it to firm-level U.S. data.
• Wage Inequality: Costinot, Vogel, and Wang show that global supply chains affect wage inequality differently for workers at the top and bottom of the chain, leading to sectoral wage dispersion.
• Empirical Evidence: Burstein, Morales, and Vogel use an assignment framework to study wage inequality between high- and low-skill workers, while Helpman, Itskhoki, Muendler, and Redding examine inequality within firms and occupations.

3. Sources of Gains from Trade

• China's WTO Entry: The reduction in trade costs following China's WTO accession in 2001 is a key factor in the increase in Chinese exports, though some models suggest it may be due to a positive technology shock.
• Trade Models: Research by Melitz and Redding explores how truncated Pareto distributions of firm productivity affect trade gains. Chaney and Ossa show that trade cost reductions can lead to increased domestic productivity and trade gains.
• Tariff Impact: Studies indicate that changes in tariffs can influence firm entry and exit, and that the impact of tariffs on welfare is significant due to their effect on profits.

4. The Gravity Equation and Intranational Trade

• Gravity Equation: The gravity equation, which models trade based on country size and distance, is a central topic in ITI research. It is being refined with new estimation techniques and extended to include intranational trade.
• Intranational Trade: Research by Agnosteva, Anderson, and Yotov examines intranational border barriers and trade costs, while Monte, Redding, and Rossi-Hansberg study spatial linkages in trade and factor markets.
• Transportation Costs: Studies show that internal transportation costs can significantly affect trade flows and that the effect of distance on trade costs is more pronounced in countries like Ethiopia and Nigeria compared to the U.S.

Key Information

• NBER Overview: The National Bureau of Economic Research is a private, nonprofit organization that conducts objective quantitative analysis of the American economy.
• Leadership: The NBER is led by President and CEO James M. Poterba, with a board of directors including Martin B. Zimmerman and others.
• Funding: The NBER relies on funding from individuals, corporations, and private foundations to maintain independence and flexibility in research.
• Research Focus: The ITI Program focuses on international trade, investment, and the impact of trade policies. It includes 60 research associates and 20 faculty research fellows.
• Future Research: The report mentions the potential for future research on the impact of global climate change on trade and economic activity.

Conclusion

The ITI Program's research emphasizes the importance of general equilibrium models and welfare analysis in understanding trade dynamics. It highlights the dual impact of trade on labor markets and consumer welfare, the role of trade costs and tariffs, and the evolving nature of global supply chains. The program also explores intranational trade and spatial economic linkages, using both theoretical and empirical approaches. The findings suggest that trade policy, technology, and market structure are critical in shaping economic outcomes, and that future research on climate change and trade is likely to expand this area further.