Liebman 2015 — Understanding the Increase in Disability Insurance Benefit Receipt in the United States

Summary

A Journal of Economic Perspectives synthesis resolving the competing Autor-Duggan ("fiscal crisis") and Reno ("demographic forces") narratives about disability insurance (DI) growth. Liebman decomposes the 1985–2007 rise in the DI beneficiary-to-worker ratio into five factors using a counterfactual simulation model built on Office of the Chief Actuary (OCACT) data. The paper's core finding is a "tale of two time periods": the 1980s bounce-back was entirely policy-driven (1984 reform); post-1992 growth was primarily demographic (baby boom aging + female labor force participation).

Key Claims

• The 1980s DI roll expansion was legislatively induced; the 1990s–2000s expansion was primarily demographic.
• For men (1985–2007 base): rising incidence explains 59%; population aging 28%; falling beneficiary mortality 8% — but using a 1977 base instead, demographics dominate and incidence is negative.
• For men specifically in 1993–2007: population aging (94%) and falling mortality (36%) explain virtually all growth; age-adjusted incidence was actually below its 1993 base (−23%).
• If musculoskeletal and mental health incidence had remained at 1985 levels (all other conditions following actual paths), the 2007 DI beneficiary ratio would be 21% lower.
• Declining beneficiary mortality is consistent with — and likely partly caused by — the compositional shift toward less-deadly conditions; it is not a pure health signal.
• U.S. disability/sickness spending = 1.3% of GDP vs. Organisation for Economic Co-operation and Development (OECD) average 1.9%; the Netherlands (post-reform) = 2.8%.
• Three actors systematically push workers onto DI: employers (cheaper than accommodation), private disability insurers (cheaper than rehabilitation), and states (shifts costs to federal government).
• The Social Security Administration's (SSA) $1 spent on continuing disability reviews (CDRs) saves $10 in future benefits, but a 1.4M CDR backlog persists because SSA's administrative budget is discretionary while benefits are mandatory.
• ~25% of DI applicants are "marginal" — they receive benefits from a lenient examiner but not a strict one; their subsequent earnings if denied average below $20,000.

Concepts Introduced or Extended

• DI Growth Decomposition
• Disability Insurance Chronology
• DI Beneficiary Mortality
• Morbidity-Mortality Distinction
• Disability Insurance Program

Entities Mentioned

• Jeffrey Liebman
• Social Security Administration
• Office of the Chief Actuary

Quotes

"The impression in policy circles that disability enrollment and spending are 'out of control' appears to be the result of confounding the legislatively induced bounce-back of incidence rates in the late 1980s and early 1990s with the largely demographically induced increases of the past two decades."

"It seems likely that a significant portion of the decline in mortality rates among DI recipients is the result of a change in the composition of the beneficiary population."

My Take

The decomposition is unusually transparent about its own instability: Liebman explicitly shows that switching from a 1985 to a 1977 base flips the dominant factor from incidence to demographics. The headline "59% incidence" figure should not be extracted without this caveat. The paper is most compelling on the subperiod analysis (1993–2007 = demographics + mortality for men), on the composition-shift finding (21% counterfactual), and on the misaligned incentives argument — all of which are structural and base-year-independent. The reform proposals are modest and evidence-conscious, explicitly calling for pilot demonstrations before broader reform.