2007年-世界发展银行全球_Mobility_and_Earnings_in_Ethiopias_Urban_Labor_Markets__1994-2004_38页_516kb

Summary of "Mobility and Earnings in Ethiopia's Urban Labor Markets: 1994-2004"

Core Content

This paper investigates changes in Ethiopia's urban labor market structure between 1994 and 2004 by analyzing labor market mobility, sectoral earnings gaps, and the sensitivity of sector choice to earnings differentials. The study is based on panel data from the Ethiopia Urban Household Socio Economic Survey conducted by Addis Ababa University and the University of Gothenburg, Sweden.

Main Findings

• Earnings Gaps: Large and sustained earnings gaps exist between the public and private sectors, as well as between the formal and informal sectors.
• Mobility Trends: The rate of mobility into higher wage sectors increased over the survey period, suggesting a decrease in labor market segmentation.
• State Dependence: The degree of state dependence in sector choice decreased, indicating that workers' initial labor market status became less predictive of their future status.
• Sectoral Transitions:
  • From 1994 to 1997, there was minimal transition out of unemployment.
  • By 2000, over half of the unemployed from the 1994 sample had found employment.
  • By 2004, the unemployment rate had declined, and more individuals were transitioning into the formal and public sectors.
• Informal Sector Mobility: The probability of transitioning from informal sector employment to formal sector jobs increased significantly over time.
• Public Sector Mobility: A substantial proportion of public sector workers moved to the private sector, with most joining formal firms.

Key Indicators of Segmentation

• Mobility Rates: An increase in the rate of mobility into higher wage sectors indicates a reduction in segmentation.
• State Dependence Parameter (δ): A decrease in the δ parameter over time suggests that the labor market is becoming less segmented.
• Earnings Sensitivity: The sensitivity of sector choice to earnings gaps increased, especially in the latter half of the survey period, indicating that earnings differentials played a more significant role in influencing sectoral transitions.

Methodology

• Data: The study uses panel data from four waves of the Ethiopia Urban Household Socio Economic Survey (1994, 1995, 1997, 2000, 2004).
• Sample Size: Each wave included 9,000 to 10,000 individuals from 1,500 to 1,600 households.
• Sector Definitions:
  • Formal Sector: Wage or salary employment in private companies, state-owned businesses, or government agencies.
  • Informal Sector: Self-employment and other private sector workers not in formal employment.
  • Public Sector: Government employment, including state-owned companies.
  • Private Sector: Formal private sector employment.
• Models: Dynamic binary sector choice models are estimated for four states: unemployment, informal sector employment, self-employment, and public sector employment.

Theoretical Context

• Segmentation Hypothesis: The hypothesis suggests that entry barriers to higher wage sectors may exist, leading to persistent wage differentials.
• Efficiency Wage Theory: Explains wage rigidity and how it affects labor market segmentation.
• Harris-Todaro Model: Used to understand labor market segmentation through wage rigidity and rural-urban migration.
• State Dependence: The degree to which past labor market status affects future status is a key indicator of segmentation.

Limitations and Assumptions

• Data Limitation: The survey samples were drawn only from the seven largest urban centers, which may not represent the broader national labor market.
• Assumptions:
  • Mobility costs, skill formation/depreciation rates, and scarring effects are assumed to be constant over time.
  • The initial labor market status is considered endogenous, which may introduce bias in the estimation of state dependence.

Conclusion

The results suggest that Ethiopia's urban labor market has become less segmented over the period 1994-2004. The observed increase in mobility rates and the decline in state dependence indicate that entry barriers to higher wage sectors may have weakened. Additionally, the increasing sensitivity of sector choice to earnings gaps further supports this conclusion. The study provides evidence that the labor market is becoming more flexible, which is a positive development for labor market efficiency and equity.