The _____ is based on three measures: life expectancy at birth, educational attainment, and average incomes based on PPP estimates.

Question

BlackTom AI · Accepted Answer

The Human Development Index (HDI) is a composite statistic combining three core dimensions: health (life expectancy at birth), education (mean years of schooling and expected years of schooling), and standard of living (GNI per capita adjusted by purchasing power parity, PPP).

1) Relevant knowledge points and concepts
- Life expectancy at birth captures the health dimension and is used directly to form the life expectancy index.
- Education is measured by two indicators: mean years of schooling (adults) and expected years of schooling (children), which together form the education index.
- Income is measured as Gross National Income (GNI) per capita expressed in PPP terms to allow cross-country comparisons of real purchasing power.
- The HDI combines these three normalized indices using a geometric mean to produce a single human development score.

2) Step-by-step reasoning
- Recognize the three measures listed in the question (life expectancy at birth, educational attainment, average incomes based on PPP) correspond exactly to the three HDI dimensions.
- No other option listed combines all three measures; thus the name for the index that uses these three is the Human Development Index.

3) Calculations / intermediate steps (formulaic demonstration)
- Life Expectancy Index (LEI) = (LE − 20) / (85 − 20).
- Education Index (EI) = (Mean Years of Schooling Index + Expected Years of Schooling Index) / 2, where MYSI = MYS/15 and EYSI = EYS/18.
- Income Index (II) = (ln(GNIpc) − ln(100)) / (ln(75,000) − ln(100)).
- HDI = (LEI × EI × II)^(1/3) (geometric mean).

4) Why the correct answer is correct
- The HDI is explicitly defined by these three dimensions and uses PPP-adjusted GNI per capita as the income component; therefore it exactly matches the measures given.

5) Why other options are incorrect
- Gross National Income (GNI) is only the income measure, not a composite of life expectancy and education.
- Gross Domestic Product (GDP) measures total economic output, not health and education dimensions.
- Cost of Living Index measures price levels, not health or education.
- Cash Reserve Ratio is a monetary policy tool for banks, unrelated to development indices.

6) Conclusion
All evidence confirms the correct answer is Human Development Index, matching the provided answer.

The _____ is based on three measures: life expectancy at birth, educational attainment, and average incomes based on PPP estimates. 单项选择题

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