2008年-世界发展银行全球_Global_Purchasing_Power_Parities_and_Real_Expenditures___2005_International_Comparison_Program_230页_2mb

Summary of "Global Purchasing Power Parities and Real Expenditures"

Core Content

The document presents the results of the 2005 International Comparison Program (ICP), a global initiative aimed at collecting comparative price data and estimating Purchasing Power Parities (PPPs) for the world's economies. The ICP is coordinated by the World Bank and involves contributions from numerous national, regional, and international statistical agencies. The report highlights the importance of PPPs in providing a more accurate means of comparing economic output and living standards across countries, as opposed to using market exchange rates, which may not reflect real price differences.

The 2005 ICP results cover 146 economies, with the global office combining regional data from five geographic areas (Africa, Asia-Pacific, Commonwealth of Independent States, South America, and Western Asia) with the Eurostat-OECD PPP program, which included 46 economies. The ring comparison method was used to link regional PPPs to a global scale without altering the relative results within each region.

Main Points

• Purchasing Power Parities (PPPs) are used to convert GDP and its components into a common currency, allowing for real comparisons of economic size and welfare across countries.
• Market exchange rates are not reliable for comparing real values due to their sensitivity to currency demand and supply, and their failure to reflect price level differences.
• The System of National Accounts (SNA93) recommends using PPPs to measure the real value of economic activity, as prices for many goods and services are determined independently of global markets.
• The ICP provides price level indexes (PLIs), which are ratios of PPPs to market exchange rates, and help assess the relative cost of goods and services in different economies.
• PPPs enable comparisons of expenditure shares and price levels for various categories such as food, health care, and investments, offering insights into economic structures and growth drivers.
• The 2005 ICP is the largest to date, with more participating economies than previous rounds, and includes both developing and developed countries.

Key Information

Data Collection and Methodology

• The ICP involves national accounts data and price data for household consumption, government final consumption, and gross fixed capital formation.
• Regional coordinating agencies (e.g., AfDB, ADB, ECLAC, ESCWA, CIS-STAT, Rosstat, and the Bureau of Economic Analysis) played a key role in collecting and processing data.
• The ring comparison method was used to combine regional PPP results into a global dataset, maintaining the relative price differences within each region.

Uses of PPPs

• PPPs are used to estimate the "dollar-a-day" poverty threshold, the Human Development Index (HDI), and the Gender Empowerment Measure (GEM).
• They help the World Health Organization (WHO) assess health inequality across economies and inform international aid programs.
• PPPs are also used to compare productivity and economic performance across regions and countries, such as GDP per employee and GDP per hour worked.

Limitations and Reliability

• PPPs are statistical estimates and are subject to error margins, which depend on the representativeness of the goods and services selected and the accuracy of price data.
• The reliability of PPPs is affected by the coverage of goods and services, especially in developing economies, where prices may be more influenced by local conditions.
• The 2005 ICP included a wide range of economies, from city-states to large and diverse countries such as China, India, and Indonesia, which together account for over 40% of the world's population.

Contributions and Support

• The ICP received significant support from national statistical offices, regional agencies, and international organizations.
• The Technical Advisory Group (TAG), led by Alan Heston, provided crucial guidance and expertise.
• The World Bank's Development Data Group (DECDG) managed the global office, with key contributions from Shaida Badiee and Misha Belkindas.
• The Global Trust Fund received support from donors including the UK Department for International Development, the IMF, the Australian Agency for International Development, and the UNDP.

Conclusion

The 2005 ICP represents a major advancement in global economic data collection and analysis. By using PPPs, it allows for more accurate comparisons of economic output and living standards across a wide range of economies. The collaboration between the World Bank, Eurostat, and OECD was essential in achieving the comprehensive and reliable data presented in this report. The results are widely used in policy-making, international development, and economic research to better understand global economic disparities and guide resource allocation.