Public employers provide health insurance coverage to nearly 16 percent of all U.S. workers. Their reactions to rapidly rising premiums can have an important effect on local markets for health insurance because of their size, their visibility, and their reflection of public policy. However, public employers are constrained in their responses by tight budgets set by elected officials and statutes regarding due process, public input, and public accountability. As insurance markets consolidate and premiums continue to increase, public employers face tough choices regarding employee benefits.