Lower bounds on inequality of opportunity and measurement error

- Lower bound estimates of inequality of opportunity can have substantial measurement error.
- Lower bound estimates of inequality of opportunity are not likely to be comparable across samples.
- Cross-country comparisons of lower bound estimates of inequality of opportunity can be misleading.

I show that lower bound estimates of inequality of opportunity can have substantial measurement error, and that measurement error can vary considerably across samples. As a consequence, the traditional cross-country comparisons researchers make can be misleading.