Social Security and Trends in Inequality
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Wealth inequality has not increased over the last three decades when Social Security is included, according to Sarin’s analysis @UofPenn. Real Social Security wealth surged from $5.6tn in 1989 to over $42tn in 2016.
New working paper from Sarin (frequent Summer's collaborator) incorporates Social Security into estimates of wealth inequality and finds that, "... Wealth inequality has not increased in the last three decades when Social Security is accounted for. When discounted at the risk-free rate, real Social Security wealth increased substantially from $5.6 trillion in 1989 to just over $42.0 trillion in 2016. When we adjust for systematic risk coming from the covariance of Social Security returns with the market portfolio, this increase remains sizable, growing from over $4.6 trillion in 1989 to $34.0 trillion in 2016. Consequently, by 2016, Social Security wealth represented 58% of the wealth of the bottom 90% of the wealth distribution. Redistribution through programs like Social Security increases the progressivity of the economy, and it is important that our estimates of wealth concentration reflect this...."
"...We find that wealth inequality has not increased once the old age retirement program is accounted for....We document that Social Security wealth has risen: In 1989, Social Security represents 17.2% of the wealth held by the bottom 90% of the wealth distribution. By 2016, this share had grown to 63.4%. Even after adjusting for systematic risk, Social Security rose from only 14.2% of the total wealth of the bottom 90%to 57.7%....This fact is well-illustrated by a simple back-of-the-envelope exercise. Piketty et al. (2018) report household wealth, excluding Social Security, totaled $79 trillion1 in 2016. The Social Security Administration (SSA) estimates that aggregate Social Security wealth was $33 trillion in the same year. We can naively assume that the top 1% receives a disproportionate share (10%) of total Social Security wealth. Social Security is progressive so this assumption vastly overstates the share of Social Security wealth at the top. Even so, including Social Security decreases the top 1% wealth share in 2016 by 9 percentage points relative to prior estimates.... Our most conservative estimates suggest that between 1989 and 2016 the top 10% share declined by 3.0 percentage points and the top 1% share increased only slightly by 1.2 percentage points. This differs drastically from recent work that excludes Social Security and finds the top 10% and 1% shares rose by over 10 percentage points over this period.The inequality estimates in this paper are still overstated, because we exclude programs like disability insurance and Medicare, which constitute a larger share of the wealth of the bottom of the distribution than the top. Overall, this paper makes the point that public transfer programs like Social Security make the U.S. economy more progressive, and it is important for inequality estimates to reflect this. Much more work is needed to arrive at a fuller understanding of wealth concentration in America.....".

Sylvain Catherine, Max Miller and Natasha Sarin, "Social Security and Trends in Inequality," University of Pennsylvania, February 29, 2020, https://papers.ssrn.com/sol3/papers.cfm























