The survey comes several months after the Congressional Budget Office generated headlines, and renewed political debate, when it updated its estimate of how Obamacare would affect employment levels.
The CBO estimated that the Affordable Care Act would lead to a total reduction in net hours worked nationally by between 1.5 percent and 2 percent during the years from 2017 to 2024. That represents a decrease in the number of full-time equivalent workers by about 2 million in 2017, and about 2.5 million in 2024, CBO said.
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The CBO said the reductions "almost entirely" would be due to people voluntarily opting to work less, "given the new taxes and other incentives they will face and the financial benefits some will receive."
CBO also said "the largest declines in labor supply will probably occur among lower-wage workers."
Obamacare proponents heralded the CBO's report as good news, arguing that it showed how the ACA enabled people to work less as a result of reducing so-called "job lock," which discourages people from retiring early or leaving their jobs to work freelance because of a dependence on employer-provided health insurance.
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Obamacare provides subsidies to low- and moderate-income people to help pay for individual health plans bought on government-run exchanges, and has also expanded Medicaid eligibility in about half of U.S. states to include most poor adults.
But Obamacare opponents said the CBO report bolstered their arguments that the ACA will be a job killer. Those opponents also have claimed that Obamacare will lead to higher health-care costs overall, including increased premiums and out-of-pocket costs.
—By CNBC's Dan Mangan