2018年-世界发展银行全球_Rural_Roads_and_Local_Economic_Development_66页_1mb

Summary of "Rural Roads and Local Economic Development"

Core Content

This working paper by Sam Asher and Paul Novosad examines the impact of India's $40 billion national rural road construction program, the Pradhan Mantri Gram Sadak Yojana (PMGSY), on local economic development. Using a regression discontinuity design (RDD) and high-resolution data, the authors analyze how new roads affect economic activity, employment, and consumption in rural villages.

Main Effects of Rural Roads

• Worker Mobility: New roads significantly increase the likelihood of workers leaving agriculture for wage labor. On average, a 10 percentage point decrease in the share of agricultural workers and a corresponding increase in wage labor is observed four years after road completion.
• Nonfarm Employment: There is a small and statistically insignificant increase in nonfarm employment within villages (about 4 additional workers per village), which explains only 20% of the overall shift in labor from agriculture.
• Consumption and Assets: The study finds no major changes in consumption, assets, or agricultural outcomes. A 10% increase in consumption is ruled out with 95% confidence.
• Agricultural Production: Farmers do not show increased ownership of agricultural equipment, shift to non-subsistence crops, or higher agricultural production. The study also finds no significant changes in agricultural land values or productivity.

Key Findings

• Limited Economic Transformation: Despite the expectation of significant economic benefits, rural roads do not transform village economies in terms of agricultural or non-agricultural productivity. Instead, they appear to facilitate access to external labor markets.
• Heterogeneous Effects: The effects of roads are most pronounced among households with small landholdings and working-age men. The reallocation of workers out of agriculture does not significantly affect household consumption, possibly because these workers are not the primary earners.
• No Compositional Changes: The study rules out the possibility that the observed effects are due to changes in the composition of the village population, such as permanent migration.
• Exogenous Variation: The authors use an implementation rule based on population thresholds to create exogenous variation in road construction, enabling a more accurate causal assessment.

Methodology and Data

• Data Sources: The study combines administrative microdata from the PMGSY program with external datasets, including the Socioeconomic and Caste Census (SECC) and the Sixth Economic Census (2013).
• Remote Sensing: Night lights and satellite-based vegetative indices (NDVI) are used to proxy for village output and agricultural production.
• Empirical Strategy: A fuzzy regression discontinuity design is employed, leveraging the population-based thresholds in road allocation. The optimal bandwidth for analysis is 84, and the results are robust to different specifications and kernel types.

Context and Program Background

• PMGSY Overview: Launched in 2000, PMGSY aimed to provide all-weather road access to unconnected villages. It targeted villages with populations exceeding specific thresholds (500 and 1,000) and was implemented with some flexibility, including the ability for local officials and elected representatives to influence road allocation.
• Funding and Implementation: The program was funded by a mix of federal and state resources, including diesel taxes and loans from international institutions. By 2015, over 400,000 km of roads had been built, benefiting 185,000 villages.

Broader Implications

• Structural Transformation: The paper contributes to the literature on the role of transportation infrastructure in structural transformation. It suggests that while roads improve access to labor markets, they may not be sufficient to transform the economic structure of remote villages.
• Policy Insights: The findings indicate that rural areas may face other structural disadvantages, such as lack of agglomeration economies and complementary inputs, which limit the impact of road construction on economic outcomes.

Conclusion

In summary, the study finds that rural roads in India primarily enable workers to access external labor markets, but do not significantly transform local economic structures. The results suggest that while roads are an important infrastructure investment, they may not be enough on their own to drive substantial economic development in remote rural areas. The paper emphasizes the need for complementary policies to address broader structural constraints in rural economies.