The Congressional Budget Office, the Rand Corporation, and the Urban Institute have estimated that the Patient Protection and Affordable Care Act (ACA) will leave employer-sponsored coverage largely intact; in contrast, some economists and benefit consultants argue that the ACA encourages employers to drop coverage, thereby making both their workers and their firms better off (a “win–win” situation). This analysis shows that no such “win–win” situation exists and that employer-sponsored insurance will remain the primary source of coverage for most workers. Analysis of three issues—the terms of the ACA, worker characteristics, and the fundamental economics of competitive markets—supports this conclusion.