Aging & Longevity

Measuring economic lifespan inequality: a new indicator of poverty-free lifespan across Europe.

TL;DR

A new indicator, Poverty-Free Lifespan Inequality, is proposed to capture heterogeneity in the distribution of poverty-free years across the population, going beyond the average measure of Poverty-Free Life Expectancy, using Sullivan-type methods and the Gini index applied to age-specific poverty prevalence data across Europe.

Key Findings

Poverty-Free Life Expectancy alone fails to capture disparities in the distribution of poverty-free years across individuals.

  • Poverty-Free Life Expectancy measures only the average number of years individuals are expected to live above the poverty threshold.
  • The indicator does not account for heterogeneity in economic well-being over the life course.
  • The authors argue this gap motivates the need for a complementary distributional measure.

The paper formally introduces Poverty-Free Lifespan Inequality as a new indicator inspired by developments in Healthy Lifespan Inequality measurement.

  • The indicator is conceptually analogous to Healthy Lifespan Inequality, extended to the economic domain.
  • The paper provides a formal mathematical definition and elaborates its foundations.
  • Policy relevance of the new indicator is explicitly discussed.

Poverty-Free Lifespan Inequality is computed using Sullivan-type methods combined with the Gini index applied to the distribution of exit from poverty-free life.

  • Age-specific poverty prevalence data are used as inputs.
  • Sullivan-type methods are used to derive the distribution of exit from poverty-free life.
  • Inequality within that distribution is quantified using the Gini index.
  • The approach is applied to European country-level data.

Poverty-Free Lifespan Inequality provides critical insights into the heterogeneity of economic well-being over the life course across European countries.

  • The indicator reveals distributional differences that are not captured by average Poverty-Free Life Expectancy alone.
  • Cross-country variation in inequality of poverty-free lifespan is demonstrated using the new measure.
  • The authors conclude the indicator has direct policy relevance for monitoring economic inequalities in aging populations.

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Citation

Nigri A. (2026). Measuring economic lifespan inequality: a new indicator of poverty-free lifespan across Europe.. Population health metrics. https://doi.org/10.1186/s12963-026-00461-w