The Luxembourg Income Study (LIS) database on which this article is based offers researchers exciting new possibilities for international comparisons based on household income microdata. Among the choices the LIS microdata allows a researcher, e.g. income definition, income accounting unit, etc., is the choice of family equivalence scale, a method for estimating economic well-being by adjusting income for measurable differences in need.The range of potential equivalence scales that can and are being used in the ten LIS countries and elsewhere to adjust incomes for size and related differences in need span a wide spectrum. The purpose of this paper is to review the available equivalence scales and to test the sensitivity of various income inequality and poverty measures to choice of equivalence scale using the LIS database. The results of our analysis indicate that choice of equivalence scale can sometimes systematically affect absolute and relative levels of poverty; and inequality and therefore rankings of countries (or population subgroups within countries). Because of these sensitivities, one must carefully consider summary statements and policy implications derived from cross-national comparisons of poverty and/or inequality.

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Previous studies find large crossnational differences in inequality amongst rich Western nations, due in large part to differences in the generosity of welfare state transfers. The United States is the least generous nation and the one having the most aftertax and transfer inequality. But these analyses are limited to the effects of cash and nearcash transfers and direct taxes on incomes, while on average, half of welfare state transfers in rich nations are inkind benefits-health insurance, education, and other services. Counting inkind benefits at government cost and accounting for the indirect taxes used to finance transfers substantially reduces crossnational differences in inequality at the bottom of the income distribution. The findings have implications for how we think about tradeoffs across welfare state domains that all nations face and we illustrate this with reference to the current U.S. debate about health insurance. © 2006 by the Association for Public Policy Analysis and Management