An integrative analysis of external debt,capital accumulation and production in Latin America,Asia-Pacific and Sub-Saharan Africa

This paper estimates the nexus of inter-relationships between public and private external debts accumulation, capital accumulation and production with panel data for the period 1970–1988 from highly indebted developing countries clustered into three distinct regions: Latin-America, Asia-Pacific and Sub-Saharan Africa. The simultaneous equations' estimation results indicate that the full effects of the public and private external debts on GNP are small and of an opposite sign, whereas an increase in the GNP level raises substantially the public and private external debts. These findings support Bulow-Rogoff's (1990) proposition that the external debts of developing countries are not a primary cause of economic slowdown.     

Self/paid-employment, public/private sector selection, and wage differentials

We use Probit models to account for the double selection problem of choice between, on the one hand, self- and paid-employment and, on the other, employment in the public and private sector. These models provide corrections for sample selection in wage equations for paid employees in the public and private sectors. Using a modified version of the Oaxaca and Ransom [J. Econom. 61 (1994) 5] procedure, we decompose the wage gap between the public and private sectors into a portion attributable to differences in characteristics, the public sector advantage, the private sector disadvantage and unobserved selection effects. Rich data for the Republic of Cyprus, a thriving economy with institutional features reminiscent of a developing economy, help determine the choice of type (self/paid) and sector (public/private) of employment. The human capital model describes the wage determination process satisfactorily. The size and distribution of public sector rents between men and women are similar to those in North America and are bracketed by results for developing countries.     

Optimal Growth with Public Capital and Public Services

We characterize optimal economic growth in an endogenous growth model in which production requires public capital (a stock) and public services (a flow) in addition to private capital and labor. We analyze the comparative static effects of changes in the fundamental technological and preference parameters of the model on the optimal values of several variables, such as the optimal rate of growth and the optimal allocation of resources among consumption, the provision of public services, and investment in public and private capital. We show that the general optimal path converges in finite time to the balanced growth optimal path. We relate our paper to important contributions to the existing literature by obtaining them as special cases of our model.     

Long-run growth and welfare effects of public policies with distortionary taxation

In a one-sector growth model with infrastructure investment, we study the impact of fiscal policies on growth. The government collects taxes on labor income and profits. The government uses these revenues to purchase infrastructure investment, provide utility enhancing government services, and to provide transfer payments to the households. We show that the balanced growth rate is an increasing function of the percent of government revenues that goes to infrastructure. We find that the growth maximizing mix of taxes depends on the elasticity of substitution between inputs. In particular, with distortionary taxes, the growth maximizing tax rate on capital is higher the lower the elasticity of substitution between private physical capital and public capital. In addition, the growth maximizing size of the government is higher when the elasticity of substitution between public and private inputs is low. We also investigate welfare effects of other public expenditures as well. Depending on the elasticity of substitution in production, the welfare implications of different public policies can be substantial.     

Public debt management and private financial development

In several developing countries, high and rising public debt is an important source of vulnerability. Strengthening debt management is a priority, but its effects on domestic economies have been hardly analyzed. This paper asks whether better public debt management could have spillover effects on the private sector, leading to more (and more stable) private capital flows and domestic credit. This is a relevant question in a context of financial deepening and increasing private capital inflows, which could be prone to episodes of bonanza, sudden stops and crises. Our results, based on a sample of developing countries, show positive spillover effects from better public debt management to private capital inflows and domestic financial deepening.     

Roles of Public Capital in Pakistan's Economy: Productivity, Investment and Growth Analysis

This study analyzes the role of public capital in Pakistan's economy, tracing the relationship between productivity of public capital and economic growth. We estimate a production function, with public capital as an inputs. The results indicate that the productivity (output elasticity) of aggregate as well as different components of public capital are sufficiently high. We also analyze substitutability and complementarity between public and private capital by estimating investment functions, revealing that public capital has worked as a substitute for private investment. The net effect of public capital on the national economy is analyzed by estimating reduced forms, with the result that public capital has a positive net effect on national product. The growth analysis shows that the contribution of public capital is declining over time.     

Private and public investment in sub-Saharan Africa: The role of instability risks

This paper explores the impact of public investment on private investment in sub-Saharan Africa using the finite mixture model. We argue that the impact of public investment on private investment differs across groups of countries with similar but unobserved characteristics. Contrary to previous studies, the paper incorporates the potential presence of hidden heterogeneity and tries to explain the group membership. Using a sample of 42 countries, we find that the impact of public investment on private investment differs across three different groups of countries. Moreover, we find that countries with high risk of conflict, terrorism and repatriation of profits are less likely to be in the group where public investment crowds in private investment. The paper underscores the need for sub-Saharan African countries to ensure private investment security by reducing the risks associated with conflicts and terrorism, and preserving contract viability and repatriation of profits.     

The dynamic investment and exit decisions of venture capitals

This study develops a continuous time model to examine a complete two-stage decision process for venture capitals (VCs), including investment in the private market at Stage 1 and exit through IPO in the public market at Stage 2. Optimal timings, investment terms, and exit decisions are investigated using the real options game theory under two cases: the same required returns in the public and private markets and a higher required return in the private market than in the public market. Our results indicate that the same required returns in the public and private markets generate an optimal investment decision at Stage 1 without relation to the exit decision in Stage 2. However, when the required return in the private market is higher than that in the public market, the exit decision will influence the investment decision. The size of the initial capital, ownership structure, growth rate and risk of industry, required returns in public and private capital markets, extent of lock-up period price pressure, and transaction costs of financing are important factors influencing the equilibrium results.     

Growth, public investment and corruption with failing institutions

Corruption is thought to prevent poor countries from catching up with richer ones. We analyze one channel through which corruption hampers growth: public investment can be distorted in favor of specific types of spending for which rent-seeking is easier and better concealed. To study this distortion, we propose a dynamic model where households vote for the composition of public spending, subject to an incentive constraint reflecting individuals’ choice between productive activity and rent-seeking. In equilibrium, the structure of public investment is determined by the predatory technology and the distribution of political power. Among different regimes, the model shows a possible scenario of distortion without corruption in which there is no effective corruption but the possibility of corruption still distorts the allocation of public investment. We test the implications of the model on a set of countries using a two-stage least squares estimation. We find that developing countries with high predatory technology invest more in housing and physical capital in comparison with health and education. The reverse is true for developed countries.      

Public capital formation and productivity growth: Some international evidence

This paper examines the proposition that public capital spending fosters productivity growth in the private sector using a pooled sample of seven OECD countries over the 1963–1988 period. The results indicate that there is a statistically significant positive relationship between public capital formation and the growth rate of labor productivity. This result is not sensitive to whether there is constant returns to scale to some or all inputs, whether the stochastic formulation of the pooled model is a fixed- or a random-effect specification, whether the model includes an energy variable, or whether the data are expressed in the log-differenced or logarithmic form.     

Wars and capital destruction

In this paper, we propose a theoretical framework to investigate the impact of conflicts and wars on key macroeconomic aggregates and welfare. Using a panel data with 9 countries from 1870 onwards, we first show that the consumption-to-output ratio is minimal during WWII for participants. While this can be explained by an increase in public spending in the USA, this cannot be the case in other countries that participated in WWII, as they experience a large fall in output during wartime. To account for this, we build a variation of a Real Business Cycle model first proposed by Hercowitz and Sampson (1991). We extend the initial model to account for specific shocks that destroy private and public capital stocks – as conflicts do – by assuming an (exogenously) time-varying parameter in the law of capital accumulation. In addition, the model imbeds generalized TFP shocks capturing standard technological factors as well as the potential effects of war on the labor force. The model is estimated and used (i) to assess the importance of capital shocks during war episodes, and (ii) to quantify the welfare effects of conflicts. We show that capital shocks are crucial to account for the macroeconomic dynamics of countries that have experienced large war-related destruction, and that the welfare losses from fluctuations can be quite large when considering data samples that include major war episodes.     

Taxes, Federal Grants, Local Public Spending, and Growth

In a dynamic model with both private and local public capital accumulation, this paper examines how federal and local income taxes, local consumption tax, and federal matching grants for local public consumption and local public investment affect the long-run equilibrium (equilibria) of private consumption, private capital accumulation, local public consumption, and local public capital stock.     

Health human capital and economic growth in Sub-Saharan African and OECD countries

This paper investigates the effects of health human capital on the growth rate of per capita income in Sub-Saharan African and OECD countries. Using an expanded Solow growth model, panel data, and a dynamic panel estimator, we find that the growth rate of per capita income is strongly and positively influenced by the stock of, and investment in, health human capital after controlling for other variables. The stock of health human capital affects the growth rate of per capita income in a quadratic way: the growth impact of health human capital decreases at relatively large endowments of health stock. Our estimates suggest that 22% and 30% of the transition growth rate of per capita income in Sub-Saharan African and OECD countries respectively, can be attributed to health. The structure of the relationship between health human capital and the growth rate of income in Sub-Saharan African countries is similar to the structure of the relationship in OECD countries. This implies that increased stocks of health human capital leads to higher steady state income. Our results have interesting policy implications.     

人力资本与基础设施投资的动力学分析

本文将公共支出引入一个两部门城市化和内生增长模型,由模型导出的人力资本跨时转移条件方便我们分析经济的过渡动力学行为。数值解结果表明,在物质资本报酬递减的情形下,公共支出的部门间配置由经济过渡动力内在地确定和稳定;如果物质资本表现出某种程度的报酬递增,公共支出的部门间配置将表现出内在不稳定。动力学分析表明,公共支出与经济增长之间存在非线性关系,换言之,存在促进经济增长的最优税率或最优公共支出比例。     

Geographic poverty traps? A micro model of consumption growth in rural China

How important are neighbourhood endowments of physical and human capital in explaining diverging fortunes over time for otherwise identical households in a developing rural economy? To answer this question we develop an estimable micro model of consumption growth allowing for constraints on factor mobility and externalities, whereby geographic capital can influence the productivity of a household's own capital. Our statistical test has considerable power in detecting geographic effects given that we control for latent heterogeneity in measured consumption growth rates at the micro level. We find robust evidence of geographic poverty traps in farm‐household panel data from post‐reform rural China. Our results strengthen the equity and efficiency case for public investment in lagging poor areas in this setting. Copyright © 2002 John Wiley & Sons, Ltd.     

Stock markets,banks and the sources of economic growth in low and high income countries

This paper studies the effects of stock markets and banks on the sources of economic growth, productivity and capital accumulation, using a large cross country panel that includes high- and low-income countries. Results show that, in low-income countries, banks have a sizable positive effect on capital accumulation. We find that stock markets, however, have not contributed to capital accumulation or productivity growth in these countries. Given the emphasis that has been placed in developing equity markets in developing countries, these findings are somewhat surprising. Conversely, in high-income countries, stock markets are found to have sizable positive effects on both productivity and capital growth, while banks only affect capital accumulation.     

Why has China Grown So Fast? The Role of Physical and Human Capital Formation*

Cross‐province growth regressions for China are estimated for the reform period. Two research questions are asked. Can the regressions help us to understand why China as a whole has grown so fast? What types of investment matter for China's growth? We address the problem of model uncertainty by adopting two approaches to model selection to consider a wide range of candidate predictors of growth. Starting from the baseline equation, the growth impact of physical and human capital is examined using panel data techniques. Both forms of capital promote economic growth. ‘Investment in innovation’ and private investment are found to be particularly important. Secondary school enrolment contributes to growth, and higher education enrolment even more so.     

Network Effects and Infrastructure Productivity in Developing Countries*

This study proposes to investigate the threshold effects in the productivity of infrastructure investment in developing countries. It concludes to their presence in the relationship between output and private and public inputs as well as network effects in the productivity of infrastructure. When the available stock of infrastructure is low, investment has the same productivity as non‐infrastructure investment. On the contrary, when a minimum network is available, the marginal productivity of infrastructure investment is greater than the productivity of other investments. Finally, when the main network is achieved, its marginal productivity becomes similar to the productivity of other investment.     

Forecasts in times of crises

Financial crises pose unique challenges for forecast accuracy. Using the IMF’s Monitoring of Fund Arrangements (MONA) database, we conduct the most comprehensive evaluation of IMF forecasts to date for countries in times of crises. We examine 29 macroeconomic variables in terms of bias, efficiency, and information content to find that IMF forecasts add substantial informational value, as they consistently outperform naive forecast approaches. However, we also document that there is room for improvement: two-thirds of the key macroeconomic variables that we examine are forecast inefficiently, and six variables (growth of nominal GDP, public investment, private investment, the current account, net transfers, and government expenditures) exhibit significant forecast biases. The forecasts for low-income countries are the main drivers of forecast biases and inefficiency, perhaps reflecting larger shocks and lower data quality. When we decompose the forecast errors into their sources, we find that forecast errors for private consumption growth are the key contributor to GDP growth forecast errors. Similarly, forecast errors for non-interest expenditure growth and tax revenue growth are crucial determinants of the forecast errors in the growth of fiscal budgets. Forecast errors for balance of payments growth are influenced significantly by forecast errors in goods import growth. The results highlight which macroeconomic aggregates require further attention in future forecast models for countries in crises.     

国际资本流动与国际贸易关系:“Mundell模型悖论”

文章通过建立“Mundell模型悖论”模型,解释发展中国家对发达国家的投资对国际贸易的影响。分析得出的结论是:(1)发展中国家对发达国家的投资是贸易导向的;(2)应该以获取发达国家的先进生产技术为投资目的;(3)发达国家和发展中国家均能增加消费,增加各自的福利。文章最后给出了政策建议。