Via Kevin Drum, the Wall Street Journal says:
Michael Feroli, chief U.S. economist for J.P. Morgan, estimates that since the recession, the worker flight to the Social Security Disability Insurance program accounts for as much as a quarter of the puzzling drop in participation rates, a labor exodus with far-reaching economic consequences.
Thank goodness we let in all those illegal immigrants to do the jobs Americans are just too disabled these days to do. Who knew that working class Americans would suffer an epidemic of vague back pain and balky knees after decades of business, political, and economist elites conspiring to hammer down their wages through non-enforcement of immigration laws?
Fortunately, our political, economic, intellectual, and moral betters somehow sensed that their fellow citizens would be getting more disabled in the future (apparently, arthroscopic surgery has been disinvented, or something), so our leaders brilliantly took action ahead of time to make sure America had an ample supply of unskilled foreign laborers to replace the Americans overwhelmed by this mysterious epidemic of disability.