15.1 Describe how free riding influences U.S. health care reform efforts.

15.2 Explain how the tragedy of the commons complicates nations’ attempts to address climate change.

15.3 Identify the political costs and benefits of teetering on a fiscal cliff.

15.4 Relate the ways that entitlement programs such as Medicare and Social Security are subject to the prisoner’s dilemma.

15.5 Discuss the collective action challenges to achieving meaningful tax reform.