As if we needed any more evidence that ObamaCare means bad news for Americans, James Pethokoukis of the American Enterprise Institute offers us a disturbing new analysis.

A new study suggests President Obama’s Affordable Care Act might have yet another huge and negative unintended consequence: if low-income adults can get health insurance through Obamacare’s Medicaid expansion, they are less likely to try and get a job — or keep a job. As Public Health Insurance, Labor Supply, and Employment Lock by Craig Garthwaite, Tal Gross, and Matthew J. Notowidigdo puts it:

Our results suggest a significant degree of “employment lock” – workers employed primarily in order to secure private health insurance coverage. The results also suggest that the Affordable Care Act – which similarly affects adults not traditionally eligible for public health insurance – may cause large reductions in the labor supply of low-income adults. … One must exercise considerable caution when directly applying our results to the ACA, but our results appear to indicate that the soon-to-be-enacted health care reform may cause substantial declines in aggregate employment.

How substantial might the shift from work to welfare be?

Using CPS data, we estimate that between 840,000 and 1.5 million childless adults in the US currently earn less than 200 percent of the poverty line, have employer-provided insurance, and are not eligible for public health insurance.

Applying our labor supply estimates directly to this population, we predict a decline in employment of between 530,000 and 940,000 in response to this group of individuals being made newly eligible for free or heavily subsidized health insurance. This would represent a decline in the aggregate employment rate of between 0.3 and 0.6 percentage points from this single component of the ACA.