Person:
Go, Delfin Sia
Author Name Variants
Fields of Specialization
Development and Growth Economics; Africa Development; Economic Modeling and Tools for Fiscal Analysis; Aid Effectiveness and Management
Degrees
Departments
Development Prospects Group, World Bank
Externally Hosted Work
Contact Information
Last updated
July 11, 2023
Biography
Delfin Go is Lead Economist in the Development Prospects Group and oversees the economic modeling and information team, which produces forward-looking and long-term scenarios that underpin special reports such as the Global Monitoring Report and the Global Development Horizons. Delfin was the lead author and task manager of the Global Monitoring Report 2011: Improving the Odds of Achieving the MDGs and the Global Monitoring Report 2010: The Millennium Development Goals After the Crisis. He was formerly Lead Economist in the office of the World Bank’s Africa Region Chief Economist, where he focused on macroeconomic issues, aid effectiveness and management, and conducted Country Policy and Institutional Assessments (CPIA) of African countries. He has also undertaken analytical work on debt issues, tools for fiscal analysis, and macro-micro linkages for probing the distributional consequences and the impact on growth, poverty, and other MDGs of alternative macroeconomic frameworks, external shocks, aid flows, as well as the composition of public expenditure. Previously, he served as the World Bank’s Country Economist and PREM Cluster Leader of Southern Africa (South Africa, Botswana, Lesotho and Namibia) and Zambia. Go first joined the World Bank as a Research Economist at the Development Research Group. Go holds a Ph.D. in Political Economy and Government from Harvard University.
Publication Search Results
1 - 10 of 12
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Dutch Disease and Spending Strategies in a Resource-Rich Low-income Country : The Case of Niger
(World Bank, Washington, DC, 2013-11)This paper examines spending plans suggested by the recent literature regarding Dutch disease and examines their implications to Niger relative to its expanding mineral sector. The key to the benefits of significant mineral revenue lies with the productivity and supply responses of spending. If significant output gain is ensured, then there is little difference across the spending plans in their effects on real consumption. The overshooting of relative prices of the non-tradable sector or the shrinking share of traded sectors in gross domestic product is also ameliorated with greater supply flexibility. Growth paths of alternative spending strategies differ markedly in timing and pattern when spending does not raise productivity. As a caution against expectations that exaggerate the benefits of mineral revenue under all circumstances, the more aggressive spending plan may result in a boom-bust cycle if fiscal adjustments and debt repayments are necessary for any significant borrowing against future revenue and productivity gains are not realized. Using extractive industries revenue for transfers to households would have a greater effect on poverty reduction in the short and medium term but the long-run gains from investment in human and physical capital are likely to offset the initial lack of pro-poor bias. Different strategies differ significantly with regard to risks and required technical implementation capacity and political capacity to sustain a chosen course of action. -
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Economy-wide and Distributional Impacts of an Oil Price Shock on the South African Economy
(World Bank, Washington, DC, 2007-09)As crude oil prices reach new highs, there is renewed concern about how external shocks will affect growth and poverty in developing countries. This paper describes a macro-micro framework for examining the structural and distributional consequences of a significant external shock-an increase in the world price of oil-on the South African economy. The authors merge results from a highly disaggregative computable general equilibrium model and a micro-simulation analysis of earnings and occupational choice based on socio-demographic characteristics of the household. The model provides changes in employment, wages, and prices that are used in the micro-simulation. The analysis finds that a 125 percent increase in the price of crude oil and refined petroleum reduces employment and GDP by approximately 2 percent, and reduces household consumption by approximately 7 percent. The oil price shock tends to increase the disparity between rich and poor. The adverse impact of the oil price shock is felt by the poorer segment of the formal labor market in the form of declining wages and increased unemployment. Unemployment hits mostly low and medium-skilled workers in the services sector. High-skilled households, on average, gain from the oil price shock. Their income rises and their spending basket is less skewed toward food and other goods that are most affected by changes in oil prices. -
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An Analysis of South Africa's Value Added Tax
(World Bank, Washington, DC, 2005-08)In this paper, the authors describe South Africa's value added tax (VAT), showing that (1) the VAT is mildly regressive, and (2) it is an effective source of government revenue, compared with other tax instruments in South Africa. They evaluate the VAT in the context of other distortions in the economy by computing the marginal cost of funds-the effect of raising government revenue by increasing the VAT rates on household welfare. Then they evaluate alternative, revenue-neutral tax systems in which they reduce the VAT and raise income taxes. For the analysis, the authors use a computable general equilibrium (CGE) model with detailed specification of South Africa's tax system. Households are disaggregated into income deciles. They demonstrate that alternative tax structures can benefit low-income households without placing excess burdens on high-income households. -
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Budget Rules and Resource Booms : A Dynamic Stochastic General Equilibrium Analysis
(World Bank Group, Washington, DC, 2014-07)This paper develops a dynamic stochastic general equilibrium model to analyze and derive simple budget rules in the face of volatile public revenue from natural resources in a low-income country like Niger. The simulation results suggest three policy lessons or rules of thumb. When a resource price change is positive and temporary, the best strategy is to save the revenue windfall in a sovereign fund, and use the interest income from the fund to raise citizens' consumption over time. This strategy is preferred to investing in public capital domestically, even when private investment benefits from an enhanced public capital stock. Domestic investment raises the prices of domestic goods, leaving less money for government to transfer to households; public investment is not 100 percent effective in raising output. In the presence of a negative temporary resource price change, however, the best strategy is to cut public investment. This strategy dominates other methods, such as trimming government transfers to households, which reduces consumption directly, or borrowing, which incurs an interest premium as debt rises. In the presence of persistent (positive and negative) shocks, the best strategy is a mix of public investment and saving abroad in a balanced regime that provides a natural insurance against both types of price shocks. The combination of interest income from the sovereign fund, transfers to households, and output growth brought about by public investment provides the best protective mechanism to smooth consumption over time in response to changing resource prices. -
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Estimating Parameters and Structural Change in CGE Models Using a Bayesian Cross-Entropy Estimation Approach
(World Bank Group, Washington, DC, 2015-01)This paper uses a three-step Bayesian cross-entropy estimation approach in an environment of noisy and scarce data to estimate behavioral parameters for a computable general equilibrium model. The estimation also measures how labor-augmenting productivity and other structural parameters in the model may have shifted over time to contribute to the generation of historically observed changes in the economic arrangement. In this approach, the parameters in a computable general equilibrium model are treated as fixed but unobserved, represented as prior mean values with prior error mass functions. Estimation of the parameters involves using an information-theoretic Bayesian approach to exploit additional information in the form of new data from a series of social accounting matrices, which are assumed were measured with error. The estimation procedure is "efficient" in the sense that it uses all available information and makes no assumptions about unavailable information. As illustration, the methodology is applied to estimate the parameters of a computable general equilibrium model using alternative data sets for the Republic of Korea and Sub-Saharan Africa. -
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Wage Subsidy and Labour Market Flexibility in South Africa
( 2010)We use a general equilibrium model to analyse the employment effects and fiscal cost of a wage subsidy in South Africa. We capture the structural characteristics of the labour market with several labour categories and substitution possibilities, linking the economy-wide results to a micro-simulation model with occupational choice probabilities to investigate the poverty and distributional consequences. The employment impact depends greatly on the elasticities of substitution of factors of production, being very minimal if unskilled and skilled labour are complements in production. The impact is improved by supporting policies, but the gains remain modest if the labour market is rigid. -
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Wage Subsidy and Labor Market Flexibility in South Africa
( 2009-03-01)In this paper, the authors use a highly disaggregate general equilibrium model to analyze the feasibility of a wage subsidy to unskilled workers in South Africa, isolating and estimating its potential employment effects and fiscal cost. They capture the structural characteristics of the labor market with several labor categories and substitution possibilities, linking the economy-wide results on relative prices, wages, and employment to a micro-simulation model with occupational choice probabilities in order to investigate the poverty and distributional consequences of the policy. The impact of a wage subsidy on employment, poverty, and inequality in South Africa depends greatly on the elasticities of substitution of factors of production, being very minimal if unskilled and skilled labor are complements in production. The desired results are attainable only if there is sufficient flexibility in the labor market. Although the impact in a low case scenario can be improved by supporting policies that relax the skill constraint and increase the production capacity of the economy especially towards labor-intensive sectors, the gains from a wage subsidy are still modest if the labor market remains very rigid. -
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Tax Policy to Reduce Carbon Emissions in South Africa
( 2009-05-01)Noting that South Africa may be one of the few African countries that could contribute to mitigating climate change, the authors explore the impact of a carbon tax relative to alternative energy taxes on economic welfare. Using a disaggregate general-equilibrium model of the South African economy, they capture the structural characteristics of the energy sector, linking a supply mix that is heavily skewed toward coal to energy use by different sectors and hence their carbon content. The authors consider a "pure" carbon tax as well as various proxy taxes such as those on energy or energy-intensive sectors like transport and basic metals, all of which achieve the same level of carbon reduction. In general, the more targeted the tax to carbon emissions, the better the welfare results. If a carbon tax is feasible, it will have the least marginal cost of abatement by a substantial amount when compared to alternative tax instruments. If a carbon tax is not feasible, a sales tax on energy inputs is the next best option. Moreover, labor market distortions such as labor market segmentation or unemployment will likely dominate the welfare and equity implications of a carbon tax for South Africa. This being the case, if South Africa were able to remove some of the distortions in the labor market, the cost of carbon taxation would be negligible. In short, the discussion of carbon taxation in South Africa can focus on considerations other than the economic welfare costs, which are likely to be quite low. -
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Aid, Growth, and Real Exchange Rate Dynamics
(World Bank, Washington, DC, 2008-01)Devarajan, Go, Page, Robinson, and Thierfelder argued that if aid is about the future and recipients are able to plan consumption and investment decisions optimally over time, then the potential problem of an aid-induced appreciation of the real exchange rate (Dutch disease) does not occur. In their paper, "Aid, Growth and Real Exchange Rate Dynamics," this key result is derived without requiring extreme assumptions or additional productivity story. The economic framework is a standard neoclassical growth model, based on the familiar Salter-Swan characterization of an open economy, with full dynamic savings and investment decisions. It does require that the model is fully dynamic in both savings and investment decisions. An important assumption is that aid should be predictable for intertemporal smoothing to take place. If aid volatility forces recipients to be constrained and myopic, Dutch disease problems become an issue. -
Publication
Budget Rules and Resource Booms and Busts: A Dynamic Stochastic General Equilibrium Analysis
(Published by Oxford University Press on behalf of the World Bank, 2017-02)This paper develops a dynamic, stochastic, general-equilibrium model to analyze and derive simple budget rules in the face of volatile public revenue from natural resources in a low-income country like Niger. The simulation results suggest three policy lessons or rules of thumb. When a resource price change is positive and temporary, the best strategy is to save the revenue windfall in a sovereign fund and use the interest income from the fund to raise citizens’ consumption over time. This strategy is preferred to investing in public capital domestically, even when private investment benefits from an enhanced public capital stock. Domestic investment raises the prices of domestic goods, leaving less money for government to transfer to households; public investment is not 100 percent effective in raising output. In the presence of a negative temporary resource price change, however, the best strategy is to cut public investment. This strategy dominates other methods, such as trimming government transfers to households, which reduces consumption directly, or borrowing, which incurs an interest premium as debt rises. In the presence of persistent (positive and negative) shocks, the best strategy is a mix of public investment and saving abroad in a balanced regime that provides a natural insurance against both types of price shocks. The combination of interest income from the sovereign fund, transfers to households, and output growth brought about by public investment provides the best protective mechanism to smooth consumption over time in response to changing resource prices.