Workers eligible to buy cheaper health insurance or receive financial incentives under the Affordable Care Act may choose to work fewer hours, according to a Congressional Budget Office report released Tuesday. Those choices, the report said, may cut the number of full-time workers by 2.3 million people by 2021. CBO originally had estimated that 800,000 people may make those choices. "By providing subsidies that decline with rising income (and increase with falling income), and by making some people financially better off, the Affordable Care Act will create an incentive for some people to work less," the report states. "The structure of the tax code — in which rising incomes push some people into higher tax brackets — will also reduce labor force participation slightly."