How does the World Bank classify countries by income?, Pg 11.

 Key Highlights:

• Countries are classified into four income groups: low, lower-middle, upper-middle, and high income.
• Classification is based on GNI per capita, converted to USD using official exchange rates.
• Income thresholds as of 2025:
  • Low income: $1,135 or less
  • Lower-middle income: $1,136 to $4,495
  • Upper-middle income: $4,496 to $13,935
  • High income: Above $13,935
• System originated in the late 1980s to determine eligibility for concessional loans.
• Thresholds are adjusted annually for global inflation, though no longer linked to lending operations.
• Countries shift groups based on GNI changes, exchange rates, or population data revisions.
• From 2004 to present, low-income population share fell from 37% to <10%, while upper-middle income share rose to 35%.

Detailed Insights:

• GNI per capita reflects not just domestic income but also remittances and income from abroad, making it a more inclusive measure than GDP.
• Absolute thresholds determine groupings, not a country's rank relative to others, ensuring consistency over time.
• Shifts between categories often signal economic growth, development gains, or conversely, downturns (e.g., Yemen, Syria in conflict).
• The income classification affects international aid eligibility, policy benchmarks, and development finance strategies.
• Rapid growth in upper-middle income countries highlights economic transitions in large nations like India, China, and Brazil.
• The declining proportion of people in low-income countries reflects successful development interventions and global economic integration.

Concepts Involved:

• Gross National Income (GNI): Total income earned by a country's residents, including income from abroad.
• Exchange Rate Conversion: Converts local currency GNI into USD for standard comparison.
• Concessional Loans: Loans offered at below-market interest rates, often to low-income countries.