Over at e21, Social Security Public Trustee Chuck Blahous writes about the accuracy of the Trustees' projections, in the wake of a two recent papers by several academics claiming that SSA's SSA actuaries, who are very influential in setting the Trustees' assumptions, have made significant and one-sided errors in recent years. Blahous states, "As a currently-serving trustee I have been asked for my view of the Kashin-King-Soneji work. Summarizing very roughly, their factual observations and analyses strike me as essentially correct, though I disagree with many of their interpretative conclusions."
Blahous makes several valuable points. He notes, for instance, that while the Kashin-King-Soneji papers focus on Social Security's mortality assumptions -- that is, projections of how quickly life spans increase -- these are only a small part of the many factors that influence social security's finances. Other factors, in particular the Great Recession, caused much larger errors in projecting Social Security finances.The papers are really one some very narrow demographic issues in the Social Security projection process, but are generalized to the broader conclusions drawn by Social Security's actuaries and trustees.
On the other hand, I can't help but think that some of the qualitative points made by Kashin-Kind-Soneji -- that the processes for setting these assumptions and doing other calculations regarding Social Security finances are too closed, secretive and turf-conscious, and that there's a (perhaps undue) emphasis on not making significant changes to these projections from year to year -- are true and important. From my own experience at SSA, which included several years in the inter-agency working group that helps construct the Trustees Report, it's an odd process. Some of their criticisms are harsh, at times overly so, but they do convey something of the flavor of how things work at SSA.
Finally, the Kashin-King-Soneji papers -- which focus on SSA's longevity assumptions -- reminded of a chart on disability projections contained in 2014 Congressional testimony by Richard Burkhauser, a disability expert at Corner who's also affiliated with the American Enterprise Institute. The chart shows the Trustees' projections of disability beneficiaries as a percentage of the working-age population relative to what actually occurred (the solid black line). These projections go back several decades, far before the post-2000 period the Kashin-King-Soneji papers study, but there is a pattern of underestimating the growth of the disability population. Relief from disability costs, it seems, was always right around the corner. If most of the growth of the DI was from predictable demographic causes, which is the SSA actuaries' argument, you'd think the increase would be more easily foreseeable.
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