Delfin S. Go

The Simplest Dynamic General-Equilibrium Model of an Open Economy

Abstract This paper presents the simplest possible general-equilibrium model of an open economy in which producer and consumer decisions are both intra- and intertemporally consistent. Consumers maximize the present value of the utility of consumption; producers maximize the present value of profits. The model solves for the set of intertemporally consistent prices. The parsimonious structure of the model is achieved by dividing the economy into two producing sectors—exports and domestic goods—and two consumed goods—imports and domestic goods. As a result, there is only one endogenous price per period to be solved for (the price of the domestic good), although “structural” questions, such as the evolution of the real exchange rate, can be posed with the model. Furthermore, with this structural breakdown, the model can be calibrated with national accounts data only. In the paper, we show how to calibrate such a model (including specification of an adjustment-cost function, to avoid “bang-bang” behavior) and use the model to examine various questions where intertemporal issues are important, including terms-of-trade shocks and tariff reform.

External shocks, adjustment policies and investment in a developing economy: Illustrations from a forward-looking CGE model of the Philippines

Abstract The rapid increase in investment and external debt of middle-income countries like the Philippines during the 1970s was perfectly ‘rational’ given existing policies. However, these countries could have done better with an appropriate mix of adjustment policies. Using a dynamic general equilibrium framework, the paper examines the sensitivity of investment and growth to external shocks and adjustment policies. It highlights the intertemporal trade-offs of tariff reform, a policy often recommended in the 1980s, emphasizing the need for complementary measures to ease macro imbalances and short-term dislocations of the protected sector.

Is Africa's Economy at a Turning Point?

In this paper, Arbache, Go, and Page examine the recent acceleration of growth in Africa. Unlike the past, the performance is now registered broadly across several types of countries-particularly the oil-exporting and resource-intensive countries and, in more recent years, the large- and middle-income economies, as well as coastal and low-income countries. The analysis confirms a trend break in the mid-1990s, identifying a growth acceleration that is due not only to favorable terms of trade and greater aid, but also to better policy. Indeed, the growth diagnostics show that more and more African countries have been able to avoid mistakes with better macropolicy, better governance, and fewer conflicts; as a result, the likelihood of growth decelerations has declined significantly. Nonetheless, the sustainability of that growth is fragile, because economic fundamentals, such as savings, investment, productivity, and export diversification, remain stagnant. The good news in the story is that African economies appear to have learned how to avoid the mistakes that led to the frequent growth collapses between 1975 and 1995. The bad news is that much less is known about the recipes for long-term success in development, such as developing the right institutions and the policies to raise savings and diversify exports, than about how to avoid economic bad times.

An Analysis of South Africa's Value Added Tax

In this paper, the authors describe South Africas 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 Africas 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.

Economy-wide and distributional impacts of an oil price shock on the south African economy

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.

Wage Subsidy and Labor Market Flexibility in South Africa

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.

Africa at a Turning Point?: Growth, Aid, and External Shocks

This book is a collection of essays that seeks to answer three interrelated sets of questions about Africas recent growth recovery. The first set of essays addresses questions about the drivers and durability of Africas growth. How different is current economic performance compared to Africas long history of boom-bust cycles? Have African countries learned to avoid past mistakes and pursued the right policies? How much of the current performance depends on good luck such as favorable commodity prices or the recovery of external assistance and how much depends on hard-won economic policy reforms. A second set of essays looks at the role of donor flows. External assistance plays a larger role in Africas growth story than in any other part of the developing world. As a result, the economic management of external assistance is a major public policy challenge, and donor behavior is a significant source of external risk. The third set of essays looks at questions arising from commodity price shocks especially from changes in the price of oil. Relative to factors such as policy failures, conflicts, and natural disasters, how important are commodity price shocks in explaining output variability in African countries? Compared to the oil price shocks in the 1970s, why have recent higher oil prices apparently had less impact on Africas growth? Oil is also now an important source of revenue for several oil exporting countries in Africa; what are the economic challenges faced by those countries? How should one analyze the macroeconomic and distributional impact of external and oil price shocks? As the essays in this volume show, laying the policy and institutional basis for longer-term growth, managing volatile commodity prices and aid flows, and turning growth in average incomes into growth in all incomes remain formidable but manageable challenges if Africa is to reach its turning point.

Assessing the Odds of Achieving the MDGs

How many countries are on target to achieve the Millennium Development Goals by 2015? How many countries are off target, and how far are they from the goals? And what factors are essential for improving the odds that off-target countries can reach the goals? This paper examines these questions and takes a closer look at the diversity of country progress. The authors argue that the answers from the available data are surprisingly hopeful. In particular, two-thirds of developing countries are on target or close to being on target for all the Millennium Development Goals. Among developing countries that are falling short, the average gap of the top half is about 10 percent. For those countries that are on target, or close to it, solid economic growth and good policies and institutions have been the key factors in their success. With improved policies and faster growth, many countries that are close to becoming on target could still achieve the targets in 2015 or soon after.

The Whys and Why Nots of Export Taxation

The authors review the arguments for taxing imports, considering two cases: one in which a country has market power in the export commodity, and one in which it does not. They conclude that for countries having market share there are strong analytical and practical arguments for an export tax. While the optimal level of the export tax may depend on the strategic behavior of other exporting and importing countries, on such practical issues as long-run market power, on whether smuggling exists, or on general equilibrium effects, these factors do not reverse the desirability of export taxation for countries with market share. Neither do alternative instruments such as export quotas and cartels, which could potentially yield a better outcome, negate this conclusion. The authors also find that countries without market share are not similarly situated to those with it. To the contrary, for most small, open economies that do not have market power in export markets, taxing imports is harmful not only to imports but also to general economic welfare and growth. Export taxes generate serious economic distortions and disincentives and are a poor instrument for encouraging higher-value-added activities. And in revenue generation, they are likely to be dominated by other tax instruments, and should be viewed as a transitional measure at best, to be replaced as soon as tax administration improves.

Dutch Disease and Spending Strategies in a Resource-Rich Low-Income Country - the Case of Niger

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.