Publication: The Impact of Infrastructure on Development Outcomes: A Meta-Analysis
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2023-03
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2023-03
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This paper presents a meta-analysis of the infrastructure research done over more than three decades, using a database of over a thousand estimates from 221 papers reporting outcome elasticities. The analysis casts a wide net to include the transport, energy, and digital or information and communication technology (ICT) sectors, and the whole set of outcomes covered in the literature, including output, employment and wages, inequality and poverty, trade, education and health, population, and environmental aspects. The results allow for an update of the underlying parameters of interest, the “true” underlying infrastructure elasticities, accounting for publication bias, as well as for heterogeneity stemming from both study design and context, with a particular focus on developing countries.
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“Gorgulu, Nisan; Foster, Vivien; Jain, Dhruv; Straub, Stéphane; Vagliasindi, Maria. 2023. The Impact of Infrastructure on Development Outcomes: A Meta-Analysis. Policy Research Working Papers; 10350. © World Bank. http://hdl.handle.net/10986/39534 License: CC BY-NC 3.0 IGO.”
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Turning to rural electrification, significant literature documents the positive impact of infrastructure on household welfare, structural transformation, and human capital formation through increased labor force participation, more time spent on education, and increased indoor air quality. Investments in the reliability of power supply also contribute to firms’ productivity. However, studies based on randomized controlled trials have not tended to find a substantial short-term impact in the context of dispersed rural populations. Finally, there is rich literature on various transport infrastructure-to-development linkages, particularly for rural roads and for Sub-Saharan Africa. While households’ income and consumption benefit from the existence of rural roads, highways are also found to contribute to firms’ competitiveness. Similarly, public transportation, railways, and ports have positive impacts on the development process.Publication What Have We Learned about the Effectiveness of Infrastructure Investment as a Fiscal Stimulus? A Literature Review(World Bank, Washington, DC, 2021-10)Since the Great Depression of the 1930s, and through the more recent Asian Crisis of 1997 and Great Recession of 2008/09, governments have experimented with Keynesian style fiscal stimulus to support employment and accelerate economic recovery. The effectiveness of these policies depends on the size of fiscal multipliers. A large body of economic literature has estimated such multipliers, with gradually increasing precision, due to econometric improvements and better ways to identify fiscal impulses. Overall, the largest multipliers are found to be associated with public investment, as opposed to other types of spending. Such public investment multipliers are typically below one in the short run, but studies with multi-year horizons suggest that values higher than unity can be attained over time. The size of multipliers is sensitive to economic conditions. During recessions, and periods of high unemployment, transfer payments appear sometimes to offer higher multipliers than public investment. An important exception is when fiscal and monetary policies are closely coordinated and interest rates approach zero, conditions that provide the strongest evidence for the efficacy of public investment multipliers. Other institutional factors also play a crucial role in determining the size of the public investment multiplier, in particular the country’s absorptive capacity, and the selection of high-quality shovel ready projects. However, there is limited empirical evidence available on the magnitude of fiscal multipliers in developing country settings, or for infrastructure sectors or subsectors specifically. 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