2007年-世界发展银行全球_Price_Structure_and_Network_Externalities_in_the_Telecommunications_Industry___Evidence_from_Sub-Saharan_Africa_43页_502kb

Summary of "Price Structure and Network Externalities in the Telecommunications Industry: Evidence from Sub-Saharan Africa"

Core Content

This paper investigates the factors that facilitate network expansion in the telecommunications sector of Sub-Saharan Africa, focusing on price structure and network externalities. It uses micro data from 45 fixed-line and mobile operators across 18 African countries to provide a detailed analysis of pricing strategies and their impact on service penetration.

Main Findings

• Network Expansion Trends:

  • Telecommunications services in Sub-Saharan Africa have seen substantial growth, with teledensity increasing from 19 per 1,000 people in 1995 to about 130 in 2004.
  • Mobile subscriptions have grown rapidly (90.7% annual growth), while fixed-line teledensity has grown more slowly (3.9% annual growth).
  • Mobile services are mostly associated with prepaid subscriptions, not monthly contracts, and have become the dominant mode of service delivery in the region.
  • Some countries, such as the Democratic Republic of the Congo and Ghana, have experienced high growth rates, while others like Eritrea and Ethiopia have seen slower progress.

• Price Structure Complexity:

  • The pricing structure in the telecommunications sector is complex, involving various forms of price discrimination.
  • The paper identifies five common price mechanisms: peak load pricing, two-part pricing, tie-in arrangements, multiple circuit holders discounts, and third-degree price discrimination (business and family discounts).
  • Termination-based price discrimination is particularly widespread among mobile operators and may be a key driver of network expansion due to its indirect network externalities.

• Price Discrimination and Network Externalities:

  • Termination-based price discrimination is more common than tie-in arrangements or strategic fee schedules such as long-term contracts.
  • The demand function estimated using a discrete consumer choice model shows that termination-based pricing can enhance network expansion.
  • High price-cost margins are observed, indicating potential for private sector-led expansion if prices are liberalized.

• Policy Implications:

  • Price liberalization is suggested as a policy tool to encourage private investment and network expansion.
  • However, ensuring reciprocal access between operators at reasonable costs remains a critical policy challenge.
  • The paper highlights the importance of regulatory frameworks in managing price competition and network externalities.

Key Factors Influencing Network Development

• Network Externalities:

  • There is a strong positive correlation between the size of the telecommunications network and its growth rate.
  • This suggests that network effects play a significant role in driving expansion.

• Geographic Factors:

  • While urbanization and population density were expected to influence access, the data shows little correlation in Sub-Saharan Africa.
  • This may be due to the dominance of mobile networks, which are less constrained by geography.

• Pricing Mechanisms:

  • Peak Load Pricing: Mobile operators are more likely to use this mechanism, with significant differences between peak and off-peak rates.
  • Two-Part Pricing: Common in fixed-line and contract-based mobile services, but less so in prepaid mobile.
  • Termination-Based Discrimination: Widely used, especially in mobile services, to differentiate prices based on the terminating network.
  • Inter-Mode Discrimination: Mobile operators are more likely to use this than fixed-line operators.

Economic and Policy Context

• The telecommunications sector is crucial for economic growth and productivity.
• It is considered a viable infrastructure for private sector-led development.
• Despite attracting significant foreign direct investment (FDI), many African countries still face challenges in attracting sufficient investment.
• The paper emphasizes the need for a sound regulatory environment and price liberalization to promote sustainable network expansion.

Data and Methodology

• The study uses micro-level data from 45 operators in 18 African countries, rather than aggregate country-level data.
• A discrete consumer choice model is employed to estimate demand functions and price elasticities.
• The analysis highlights the endogeneity between price, quantity, and income, suggesting that traditional regression methods may not fully capture the relationships.

Conclusion

• Discriminatory pricing, particularly termination-based price discrimination, is found to be effective in expanding the telecommunications network.
• High price-cost margins indicate that private operators have the potential to drive expansion if price controls are relaxed.
• The paper calls for continued price liberalization and regulatory reform to support the development of telecommunications infrastructure in Sub-Saharan Africa.