How does the World Bank classify countries by income?

Why in the News?

The World Bank has released its annual update of country income classifications for 2024–25, categorising economies into four groups-low, lower-middle, upper-middle, and high income-based on revised Gross National Income (GNI) per capita thresholds. This update is crucial for global development tracking, policy planning, and eligibility for concessional lending by international institutions.

Background

• The World Bank first introduced income classification in the late 1980s, primarily to decide which countries were eligible for concessional lending.
• These classifications were initially tied to lending operations-low-income countries qualified for soft loans.
• Over time, this system evolved into a universal method to categorise countries for economic research, policymaking, and statistical comparison.
• The original thresholds were set based on income distributions and World Bank lending criteria, but today they are updated annually for inflation using a global deflator.
  

Feature

Classification Groups:

• Low income: GNI per capita of $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

Core Methodology:

• Based on Gross National Income (GNI) per capita in current U.S. dollars
• GNI includes income earned abroad by residents.
• Local currency GNI is converted into USD using official exchange rates.

Absolute Thresholds:

• Classification is absolute, not relative, and unaffected by the performance of other countries.
• Updated yearly using a global inflation adjustment (World Bank Atlas method).

Mobility Between Groups:

• Countries can move up as their economies grow.
• They can also drop due to war, crisis, exchange rate shocks, or data revisions (e.g., Syria and Yemen moved to low-income in 2017).
  Movements depend on changes in GNI, exchange rates, and population data.

Global Trends:

• In 2004, 37% of the global population lived in low-income countries.
• In 2024: Less than 10% fall in that group; upper-middle income countries now host 35% of the population.

Challenge

Volatility Due to Exchange Rates:

• Since GNI is calculated in USD, currency fluctuations can shift countries across income brackets without real income changes.

Static Thresholds vs Dynamic Realities:

• The use of absolute thresholds may mask regional or intra-country inequality and development nuances.

Not Linked to Lending Anymore:

• Disconnection from lending policies may lead to confusion about its operational significance in development funding.

Population Weight Ignored:

• Classifications are not population-weighted; thus, some groups are much more populous than others, affecting the global development focus.

Oversimplification Risk:

• A four-tier system might oversimplify diverse economic realities, especially in large countries with high internal inequality.

Way Forward

Complementary Metrics:

• Use income classification alongside multidimensional poverty indices, the Human 
• Development Index (HDI), and inequality measures (Gini coefficient) for a more holistic view.

Currency Adjustment Alternatives:

• Consider introducing Purchasing Power Parity (PPP)-based alternatives for more stable comparisons unaffected by currency volatility.

Tailored Policy Application:

• Avoid one-size-fits-all development aid strategies. Recognise that upper-middle-income countries can still have large poor populations.

Refinement of Thresholds:

• Explore the potential for more granular subcategories or regional variants to better target aid and interventions.

Strengthen Communication:

• Educate policymakers and the public on what the classification means-and does not mean, especially regarding eligibility for aid or performance benchmarking.

Conclusion

The World Bank’s income classification system remains a foundational tool for economic comparison and development planning. While simple and standardised, its absolute and GNI-based nature demands complementary metrics for a fuller understanding of global inequality, progress, and aid effectiveness. As countries shift up or down the income ladder due to various factors, policymakers must interpret these classifications judiciously, balancing them with deeper, multidimensional insights.

MAINS PRACTICE QUESTION

Question. How does the World Bank classify countries by income, and what are the features, challenges, and policy implications of this classification system?