2014年-WTO世界贸易组织_Knowledge_spillovers_through_international_supply_chains_23页_671kb

Summary of "Knowledge Spillovers through International Supply Chains"

Core Content

This working paper by Roberta Piermartini and Stela Rubinová explores the role of international supply chains in facilitating knowledge spillovers across countries. Using industry-level R&D and patent data from 29 countries between 2000 and 2008, the authors investigate how supply chain linkages influence the spread of knowledge and innovation.

Main Viewpoints

1. Supply Chains as a Knowledge Transfer Channel

• International supply chains are a significant channel for knowledge transfer, involving trade in goods, intermediate inputs, foreign direct investment (FDI), and the movement of skilled personnel.
• Knowledge spillovers occur when firms in one country benefit from the R&D activities of firms in another country through supply chain interactions.
• The paper argues that supply chain linkages can increase the accessibility of foreign knowledge, particularly non-codified knowledge, which is often transferred through face-to-face communication.

2. Empirical Findings

• A statistically significant effect of supply chain linkages on knowledge spillovers is found.
• The intensity of supply chain linkages is positively correlated with the magnitude of knowledge spillovers.
• The traditional view that knowledge spillovers depend on geographical proximity is challenged, as the study finds that knowledge flows are more strongly associated with supply chain intensity than with physical distance.
• The "second unbundling" period (1985–1995) saw a dramatic increase in knowledge flows, coinciding with the expansion of international supply chains.

3. Methodology

• The authors use the number of patent applications as a proxy for innovation.
• They construct four measures of supply chain linkages:
  • I2P: Imports of intermediate inputs to produce.
  • I2E: Imports of intermediate inputs processed for exports.
  • I2RE: Imports of intermediate inputs re-exported back to the source country.
  • I2REP: Imports of intermediate inputs re-exported for further processing.
• These measures are standardized to a scale from 0 to 1 for easier interpretation.
• A distance-weighted R&D pool is also constructed to test the robustness of findings against geographical proximity assumptions.

4. Control Variables

• The empirical model includes country and industry fixed effects.
• Control variables include:
  • Real GDP and GDP per capita.
  • Index of patent protection.
  • Human capital (number of researchers per capita).
• These variables are included to account for the broader economic and institutional environment that may influence innovation and R&D productivity.

5. Robustness and Policy Implications

• The results are robust to different specifications, including panel regressions and instrumental variable approaches.
• The paper supports the idea that participation in international supply chains can enhance domestic R&D productivity and foster economic development.
• However, the benefits depend on the type of participation, suggesting that policies should be tailored to the nature of supply chain involvement.

Key Information

Sample and Data

• The study uses data from 29 countries across 8 manufacturing industry groups.
• Data sources include:
  • OECD Patent Statistics for patent applications.
  • OECD Research and Development Statistics for R&D expenditures.
  • World Input-Output Database (WIOD) for constructing supply chain linkages.

Industry-Level Insights

• ISIC 30 to 33 (office, computing, and medical equipment) accounts for the largest share of R&D expenditures and patent applications.
• ISIC 24 (chemicals) also has a high share of R&D and patent activity.
• ISIC 23 (refined petroleum) has the lowest share in both R&D and patent applications.

Country-Level Insights

• USA, Japan, and Germany account for 67% of total R&D expenditures in the sample.
• China, France, Korea, and the UK together account for almost 90% of R&D and patent activity.
• The foreign R&D pool is more significant in countries highly integrated in international supply chains, such as Germany, France, and Belgium, as well as in smaller or less developed economies like the Czech Republic and China.

Policy Relevance

• Policies that encourage participation in international supply chains can promote knowledge spillovers and innovation.
• However, the extent of benefits varies depending on the depth and type of supply chain involvement.
• The study suggests that vertical FDI and supplier development programs may be effective in fostering innovation and economic development.

Conclusion

The paper concludes that international supply chains play a crucial role in the diffusion of knowledge and innovation across countries. It highlights the importance of understanding the mechanisms through which knowledge is transferred and the need for policies that support supply chain integration while accounting for the specific characteristics of such linkages.