TY - BOOK AU - Abdulkadiroglu,Atila AU - Pathak,Parag A. AU - Roth,Alvin E. ED - National Bureau of Economic Research. TI - Strategy-proofness versus Efficiency in Matching with Indifferences: Redesigning the New York City High School Match T2 - NBER working paper series PY - 2009/// CY - Cambridge, Mass. PB - National Bureau of Economic Research N1 - April 2009; Hardcopy version available to institutional subscribers N2 - The design of the New York City (NYC) High School match involved tradeoffs among efficiency, stability and strategy-proofness that raise new theoretical questions. We analyze a model with indifferences--ties--in school preferences. Simulations with field data and the theory favor breaking indifferences the same way at every school --single tie breaking-- in a student-proposing deferred acceptance mechanism. Any inefficiency associated with a realized tie breaking cannot be removed without harming student incentives. Finally, we empirically document the extent of potential efficiency loss associated with strategy-proofness and stability, and direct attention to some open questions UR - https://www.nber.org/papers/w14864 UR - http://dx.doi.org/10.3386/w14864 ER -