Wages and Labor Management in African Manufacturing

Using matched employer-employee data on 10 African countries, this paper examines the rela- tionship beween wages, worker supervision, and labor productivity in manufacturing. Wages increase with Þrm size for both production workers and supervisors. We develop a two-tier model of super- vision that can account for this stylized fact and we Þt the structural model to the data. Employee data is used to derive a Þrm-speciÞc wage premium that is purged of the effect of worker observables. We Þnd a strong effect of both supervision and wages on effort and hence on labor productivity. La- bor management in sub-Saharan Africa appears problematic, with much higher supervisor-to-worker ratios than in Morocco and a higher elasticity of effort with respect to supervision.

Firm size and human capital as determinants of productivity and earnings

The evidence that earnings rise with firm size and that human capital affects earnings based on labour market data are two of the most robust empirical findings in economics. In contrast the evidence for scale economies in firm data is very weak. The limited direct evidence of human capital on firm productivity suggests that human capital is indeed productive and that the magnitudes are consistent with the findings based on individual data. The common objection to accepting the role of size and human capital as determinants of either earnings or productivity has been the role of unobserved factors. In this paper we investigate the roles of size and human capital in determining both earnings and productivity using a panel data set of matched labour firm data which allows us to control for such factors. We argue that neither the unobservable quality of labour, nor the unobservable characteristics of the workplace, is the source of the relationship between firm size and earnings, and that this effect can have a rent-sharing interpretation. For our data human capital is of minor importance in explaining either the distribution of earnings or productivity across firms of differing size.African manufacturing, productivity, earnings, human capital, firm size, rent sharing, efficiency wages.

Size and Efficiency in African Manufacturing Firms:Evidence from Firm-Level Panel Data

Three dimensions of the performance of firms in Ghana’s manufacturing sector are investigated in this paper: their technology and the importance of technical and allocative efficiency. We show that the diversity of factor choices in not due to a non-homothetic technology. Observable skills are not quantitatively important as determinants of productivity. Technical inefficiency is not lower in firms with foreign ownership or older firms and its dispersion across firms is similar to that found in other economies. Large firms face far higher relative labour costs than small firms. If these factor price differentials could be levelled out, substantial gains thorough improvements in allocative efficiency would be possible.African manufacturing, productivity, efficiency, human capital, firm size

Adjustment Costs and the Identification of Cobb Douglas Production Functions

Cobb Douglas production function parameters are not identified from cross-section variation when inputs are perfectly flexible and chosen optimally, and input prices are common to all firms. We consider the role of adjustment costs for inputs in identifying these parameters in this context. The presence of adjustment costs for all inputs allows production function parameters to be identified, even in the absence of variation in input prices. This source of identification appears to be quite fragile when adjustment costs are deterministic, but more useful in the case of stochastic adjustment costs. We illustrate these issues using simulated production data.

Are African manufacturing firms really inefficient? Evidence from firm-level panel data

Three dimensions of the performance of firms in Ghana’s manufacturing sector are investigated in this paper: their technology and the importance of technical and allocative efficiency. We show that the diversity of factor choices is not due to a non-homothetic technology. Observable skills are not quantitatively important as determinants of productivity. Technical inefficiency is not lower in firms with foreign ownership or older firms and its dispersion across firms is similar to that found in other economies. Large firms face far higher relative labour costs than small firms. If these factor market distortions could be removed substantial gains thorough improvements in allocative efficiency would be possible.African manufacturing, productivity, efficiency, firm size.

Wages and Labor Management in African Manufacturing

Using matched employer-employee data on 10 African countries, this paper examines the relationship beween wages, worker supervision, and labor productivity in manufacturing. Wages increase with firm size for both production workers and supervisors. We develop a two-tier model of supervision that can account for this stylized fact and we fit the structural model to the data. Employee data is used to derive a firm- specific wage premium that is purged of the effect of worker observables. We find a strong effect of both supervision and wages on effort and hence on labor productivity. Labor management in sub-Saharan Africa appears problematic, with much higher supervisor-to-worker ratios than in Morocco and a higher elasticity of effort with respect to supervision.

Openness and human capital as sources of productivity growth: An empirical investigation

Do openness to trade and higher levels of human capital promote faster productivity growth? That they do is a key implication of several versions of endogenous growth theory. To answer the question we use panel data on 93 countries spanning the 1970-2000 period. Controlling for fixed effects as well as endogeneity, the results show a significant effect of openness on productivity growth. If the level of openness of an economy is doubled the underlying rate of technical progress will increase by 0.8 per cent per annum. We find an effect, significant at the ten per cent level, of the level of human capital on the level of income but no effect on underlying productivity growth. Our preferred estimator combines high and low frequency differences of the data. We discuss reasons why this estimator is well suited for empirical analysis of economic growth.Productivity, openness, human capital, growth, panel data

Openness and Human Capital as Sources of Productivity Growth: An Empirical Investigation

Do openness to trade and higher levels of human capital promote faster productivity growth? That they do is a key implication of several versions of endogenous growth theory. To answer the question we use panel data on 93 countries spanning the 1970-2000 period. Controlling for fixed effects as well as endogeneity, the results show a significant effect of openness on productivity growth. If the level of openness of an economy is doubled the underlying rate of technical progress will increase by 0.8 per cent per annum. We find an effect, significant at the ten per cent level, of the level of human capital on the level of income but no effect on underlying productivity growth. Our preferred estimator combines high and low frequency differences of the data. We discuss reasons why this estimator is well suited for empirical analysis of economic growth.Productivity, openness, human capital, growth, panel data

Trade and human capital as determinants of growth

Do openness to trade and higher levels of human capital growth promote faster growth? To answer that question we use a panel of countries to investigate the role of human capital and two measures of openness in determining both the level of income and its growth rate. We argue that focusing on the levels of income by estimating a production function will give misleading estimates if there are unobserved differences in the underlying growth of technical efficiency across countries that are correlated with the explanatory variables. Using a growth rate equation, where we allow for country fixed effects and for possible endogeneity of explanatory variables, we show that both measures of openness, one the Sachs-Warner measure which reflects policy, and one from the PENN World Tables, the share of trade in GDP, give similar results. We argue that openness has a highly significant and large effect on the underlying rate of growth of productivity, while human capital does not.Productivity, openness, human capital and growth.

Adjustment costs and the identification of Cobb Douglas production functions

Cobb Douglas production function parameters are not identified from cross-section variation when inputs are perfectly flexible and chosen optimally, and input prices are common to all firms. We consider the role of adjustment costs for inputs in identifying these parameters in this context. The presence of adjustment costs for all inputs allows production function parameters to be identified, even in the absence of variation in input prices. This source of identification appears to be quite fragile when adjustment costs are deterministic, but more useful in the case of stochastic adjustment costs. We illustrate these issues using simulated production data.Production functions, adjustment costs, identification