2013年-世界发展银行全球_How_Long_Will_It_Take_to_Lift_One_Billion_People_Out_of_Poverty__20页_351kb

Summary: How Long Will It Take to Lift One Billion People Out of Poverty?

Core Content

This paper by Martin Ravallion explores the time required to lift one billion people out of extreme poverty, defined as living on less than $1.25 a day at 2005 purchasing power parity. It presents two alternative scenarios: a pessimistic path and an optimistic path, based on different assumptions about future economic growth and poverty reduction.

Main Points

• Current Poverty Situation (2012): Approximately 1.2 billion people live in extreme poverty, with a poverty rate of 19% in the developing world.
• Poverty Reduction Trends:
  • The poverty rate has been falling at a robust rate of about 1 percentage point per year since 1981.
  • The developing world as a whole has seen a significant acceleration in poverty reduction since the year 2000.
• Economic Growth:
  • The developing world has maintained a GDP growth rate of around 6% annually, with China and India playing a major role.
  • Growth has been uneven across regions, but key regions like East Asia, South Asia, and sub-Saharan Africa have shown strong growth.
• Inequality Trends:
  • Overall inequality in the developing world has shown a slight decline, but this has been mostly due to progress in China and India.
  • Inequality within countries has not consistently risen with growth, contradicting the Kuznets Hypothesis.
• Poverty Measures:
  • The paper uses the headcount index (proportion of people in poverty) and the poverty gap (PG) index (average distance below the poverty line) to assess poverty trends.
  • The PG index has declined from 21% in 1981 to 6% in 2010, and further reductions are expected.

Key Scenarios

Pessimistic Path

• Assumes the developing world outside China returns to the slower pace of poverty reduction seen in the 1980s and 1990s.
• China continues its progress, but the rest of the developing world does not.
• Outcome:
  • It would take 50 years or more to lift one billion people out of extreme poverty.
  • By 2030, the overall poverty rate would be 11.8%, with 0.8 billion people in poverty.
  • The 3% poverty rate (target for one billion people out of poverty) would not be reached until 2060.

Optimistic Path

• Assumes the current pace of poverty reduction is maintained.
• Consistent with both linear projections and nonlinear simulations.
• Outcome:
  • One billion people could be lifted out of extreme poverty by 2025–2030.
  • The poverty rate would reach 3% by 2027 (with a 95% confidence interval of 2025–2030).
  • The headcount index is expected to fall from 22.4% in 2010 to 3% by 2027.
  • The income gap ratio would decline from 0.31 in 2010 to 0.26 in 2027 under this scenario.

Methodology

• Two main methods are used to project future poverty trends:
  1. Linear projections of historical poverty rate data.
  2. Nonlinear simulations that consider inequality-neutral growth.
• The paper acknowledges that while past trends are useful, future projections depend on sustained efforts and favorable conditions.

Conclusion

• The optimistic path is more realistic and achievable, given the recent progress and current economic growth rates.
• The pessimistic path is unlikely to be pursued due to the potential for continued development and policy improvements.
• The paper emphasizes the importance of maintaining the current trajectory of poverty reduction and economic growth to meet the goal of lifting one billion people out of extreme poverty.