Can the uninsured afford health insurance?

We propose several definitions of affordability and examine the
implications of alternative definitions for estimates of the proportion
of uninsured who are unable to afford coverage.  We find that, depending
on the definition, health insurance was affordable to between
one-quarter and three-quarters of the uninsured in the United States in
2000.

That is Kate Bundorf and Mark Pauly, here is the paper.  The pointer is from the new AEI magazine, The American, which so far has been consistently interesting.