This paper looks at the stability of policy outcomes under di erent electoral systems. The political game among parties and party supporters of di erent ideologies involves pre-election coalition formation as well as after-election parliamentary bargaining. Voters' preferences vary across districts and over time. We show that under proportional representation there exists a unique stable policy...

May-June 2012 To the Editor: In the SeptemberOctober 2011 issue, Daniel Groll addresses the question of what health care providers can know about patients’ interests (“What Health Care Providers Know”). He offers helpful refinements to my claim in Patient, Heal Thyself (Oxford, 2008) that generally health providers cannot know what serves patient interests. I am honored that a careful student o...