Two game theoretical problems--the Prisoner’s Dilemma and the Problem of the Commons--are explored in detail. Both collective decision-making scenarios are structured such that all parties making rational choices ensures a less desired outcome for each than if each had chosen individually-less-preferred options. To conclude, Professor Gendler discusses various strategies that can be used to address both problems. Complete course materials are available at the Open Yale Courses website: http://oyc.yale.edu This course was recorded in Spring 2011.