Case Study

Interpreting 1980 Global Income Data

A three-dimensional chart from 1980 displays global income distribution. On one axis, countries are arranged from poorest to richest based on their average income. For each country, the population is divided into ten equal-sized income groups (from poorest 10% to richest 10%), which are shown on a second axis. The height of the bar for each group represents its average annual income.

Consider two individuals in 1980:

  • Person A is in the richest 10% of the population of a country that ranks among the poorest 25% of all countries.
  • Person B is in the poorest 10% of the population of a country that ranks among the richest 25% of all countries.

Based on the structure of this chart, analyze the relationship between their likely incomes. Is it certain that Person B is richer than Person A? Explain your reasoning by referencing the two dimensions of inequality revealed by the chart's design.

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Updated 2025-07-30

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