Louise Radnofsky and Stephanie Armour had a piece in The Wall Street Journal that looked at the small and shrinking impact of removing the Individual Mandate (or more accurately, removing the penalty Supreme Court-created tax imposed for not satisfying the IM) on the health coverage providing industry.  The piece is worth the read, but there was one remark quoted at the end that wants a particular look.

“Making the risk pool stable is a vital part” of keeping individual insurance premiums in line with the overall cost to cover a person insured through a larger group or employer, said Andy Slavitt, a top health official in the Obama administration.

You bet. However, in order to stabilize a risk pool, it’s necessary to understand risk pools. A healthy young man does not have the same risks as an elderly man or woman, and so he does not belong in either of their risk pools, either of them in his, and neither of those two in each other’s. A healthy woman of child-bearing age does not share the same risks as a post-menopausal woman, and neither share the same risks as a man of any age. None of those three groups belong in the same risk pool as any of the others.

Health-related risk pools, to be effective and accurate at estimating future health coverage costs and so arriving at reasonable fees for accepting the transfer of the risks involved, need to be reasonably homogeneous.  Belonging to the species homo sapiens is not sufficiently homogeneous.