2005年-世界发展银行全球_Roads_out_of_Poverty__Assessing_the_Links_between_Aid_Public_Investment_Growth_and_Poverty_Reduction_75页_703kb

Summary of "Roads out of Poverty? Assessing the Links between Aid, Public Investment, Growth, and Poverty Reduction"

Core Content

This paper presents a macroeconomic framework to assess the interlinkages between foreign aid, public investment, economic growth, and poverty reduction, with a specific application to Ethiopia. The model is designed to capture both the supply-side and demand-side effects of aid and public investment, while also incorporating potential congestion effects and Dutch disease phenomena.

Main Views and Key Information

1. Theoretical Framework

• The model is a one-sector, two-good framework, where domestic and foreign goods are imperfect substitutes.
• Public investment is divided into education, infrastructure, and health, each affecting the production process differently.
• The supply side of the economy is modeled with a nested CES production function, which accounts for the complementarity and substitutability between different factors of production, including public capital.

1.1. Production Function

• The economy produces a composite good using land, educated labor, private capital, and public capital (health and infrastructure).
• Educated labor is derived from raw labor through a publicly-funded education system.
• The quality of infrastructure is considered in the production function, and congestion effects are modeled through the lagged output and public capital per capita.

1.2. Dutch Disease Effects

• Foreign aid, especially when directed to nontraded goods, can lead to real exchange rate appreciation and decreased competitiveness of exports.
• This may result in a decline in export performance and adverse effects on growth.
• However, learning by doing and endogenous productivity gains may lead to ambiguous long-run effects on the real exchange rate.

1.3. Fiscal and Policy Effects

• The model integrates fiscal constraints and foreign aid as a source of government expenditure.
• Aid effectiveness depends on the composition of aid and the policy environment.
• The fiscal response model suggests that aid can influence tax collection, government spending, and fiscal sustainability.

2. Empirical Link Between Aid and Growth

• There is ongoing debate about the effectiveness of aid in promoting growth.
• Burnside and Dollar (2000) argue that aid is only effective in countries with good macroeconomic policies.
• Dalgaard and Hansen (2001) and Easterly, Levine, and Roodman (2003, 2004) challenge this view, suggesting that aid can spur growth unconditionally but with diminishing marginal returns.
• Public investment is generally found to have a positive effect on growth, especially when it improves productivity and capital formation.

3. Policy Simulations and Applications

• The model is calibrated for Ethiopia, a low-income country with low per capita income.
• It is used to simulate the impact of changes in aid levels, aid composition, and public investment allocation on growth and poverty reduction.
• Nonfood aid is emphasized as a key component in achieving Millennium Development Goals (MDGs), particularly in reducing poverty.
• A "big push" scenario is considered, where a large increase in nonfood aid over a limited period could lead to sustained growth and poverty reduction.

4. Poverty Analysis

• The model is linked to household survey data to assess the impact of policy shocks on poverty.
• Consumption growth is used to estimate poverty reduction, through partial elasticities.
• The flexibility of wages is assumed, which allows for efficient labor allocation but does not rule out open unemployment due to the asymmetric transformation of raw labor into educated labor.

Key Findings

• Foreign aid can have mixed effects on growth and poverty, depending on its composition, policy environment, and economic conditions.
• Public investment in education and infrastructure is crucial for poverty reduction and sustained growth.
• Congestion effects may reduce the productivity gains from public investment over time.
• Dutch disease effects can be amplified or mitigated depending on the degree of complementarity between public and private capital.
• The model's calibration and policy simulations provide quantitative insights into how aid and public investment can be used to achieve poverty reduction goals.

Conclusion

The paper contributes to the literature by developing a quantitative macroeconomic model that integrates the effects of aid and public investment on growth and poverty, and is tailored for low-income countries. It highlights the importance of policy design, aid composition, and public investment allocation in achieving poverty reduction and economic growth, and provides a basis for policy simulations and strategic planning.