In this brief video excerpt from his testimony before a subcommittee of the House Ways and Means Committee, University of Pennsylvania Wharton School Professor Mark Duggan explains how the Social Security Disability Insurance program has changed dramatically over the last twenty years -- and in ways that have triggered its current fiscal crisis. Duggan is also an executive with the Penn-Wharton Public Policy Initiative, a newly-established Washington center that provides scholarly evidence to capital policymakers.
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