2008年-世界发展银行全球_Multi-Product_Exporters___Diversification_and_Micro-Level_Dynamics_37页_638kb

Summary of "Multi-Product Exporters: Diversification and Micro-Level Dynamics"

Core Content

This paper explores the dynamics of firm-product level behavior in the context of export expansion, using a detailed dataset covering about 85% of Mexican industrial output from 1994 to 2003. It aims to bridge the gap between theoretical advancements in trade models and empirical evidence on multi-product firms.

Main Findings

1. Product Turnover and Core Competencies

   • There is substantial product turnover at the firm-product level in response to declining trade costs.
   • Firms' decisions to introduce or drop export products are significantly influenced by their "core competencies," which refer to the firm's cost advantage or expertise in manufacturing certain products.
   • These findings align with recent theoretical models that predict product-level adjustments in response to trade policy changes.

2. Mexican Exporters vs. US Exporters

   • Multi-product exporters are less prevalent in Mexico compared to the US.
   • In Mexico, most exports come from single-product exporters, whereas in the US, firms exporting five or more products account for 98% of total exports.
   • Mexican firms tend to export fewer products, with 80% of exporters selling only one or two products, indicating a different export strategy.

3. New Exporters Start Small

   • New exporters typically begin with a small number of products and low export volumes.
   • This behavior is consistent with the model by Rauch and Watson (2003), which suggests that firms test foreign markets with small orders due to search costs and information asymmetries.
   • Established exporters may also start with small export volumes before expanding.

4. Investment Drives Export Variety Introduction

   • The introduction of new export products is preceded by a surge in investment.
   • This finding supports the theoretical model by Constantini and Melitz (2007), which posits that firms innovate ahead of anticipated trade liberalization to enter export markets.

5. Export Growth is Driven by Volume Expansion

   • While the number of exported products increased, the growth in the volume of pre-existing export products was the main driver of the export boom.
   • Changes in the volume of existing products account for most of the export growth, highlighting the importance of the intensive margin.

Key Information

• Data Sources: The study uses firm-product level data from the Encuesta Industrial Mensual (EIM) and Encuesta Industrial Anual (EIA), administered by INEGI.
• Data Coverage: The dataset includes approximately 85% of Mexican industrial output and covers several thousands of products during the period 1994–2003.
• Period of Analysis: The study focuses on the period following the introduction of NAFTA and the 300% devaluation of the peso, which had a significant impact on Mexican exports.
• Product Churning: There is significant product churn, with about 20% of total export varieties being introduced or dropped annually.
• Sectoral Differences: Product churn is most prevalent in sectors like textiles, garments, leather, and wood products, while it is minimal in mineral-based industries.
• Policy Implications: The findings suggest that policies lowering investment costs may stimulate export booms. Additionally, export promotion strategies that work in developed countries may not be suitable for developing countries.
• Theoretical Contributions: The study provides empirical support for recent models that incorporate firm-level heterogeneity and product-level dynamics, particularly those focusing on core competencies, investment, and the relationship between intensive and extensive margins.

Structure of the Paper

• Introduction: Discusses the importance of micro-level dynamics in understanding export growth and structural change.
• Data Description: Details the sources and characteristics of the firm-product level dataset used.
• Firm-Level Dynamics: Examines the number of export products per firm and compares Mexican and US exporters.
• Product-Level Heterogeneity: Highlights the churn in export products and the role of core competencies.
• Intensive and Extensive Margins: Demonstrates the positive correlation between the number of exported products and the average export value per product.
• Export Discovery and Diversification: Shows how new export varieties are introduced following investment surges and how this contributes to the Mexican export boom.
• Conclusion: Summarizes the implications of the findings for trade theory, policy, and future research.