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Title : The threshold structure of Top Trading Cycles (TTC) by Leshno and Lo
link : The threshold structure of Top Trading Cycles (TTC) by Leshno and Lo
The threshold structure of Top Trading Cycles (TTC) by Leshno and Lo
A new look at top trading cycles:
The Simple Structure of Top Trading Cycles inSchool Choice
Jacob D. Leshno and Irene Lo April 25, 2017
Abstract: "Many cities determine the assignment of students to schools through a school choice mechanism. The prominent Top Trading Cycles (TTC) mechanism has attractive properties for school choice, as it is strategy-proof, Pareto efficient, and allows school boards to guide the allocation by specifying priorities. However the combinatorial description of TTC makes it non-transparent to parents and difficult for designers to analyze. We give a tractable characterization of the TTC mechanism for school choice: the TTC assignment can be simply described by n^2 admission thresholds, where n is the number of schools, and these thresholds can be easily observed after running the mechanism. To calculate these thresholds, we de fine TTC through trade balance equations. In a continuum model these equations correspond to a differential equation whose solution can give closed form expressions for the admission thresholds.
The model allows us to compute comparative statics, and evaluate welfare. As applications of the model we solve for optimal investment in school quality, explore the design of the priority structure, and provide comparisons between TTC and other school choice mechanisms that help explain empirical findings. To validate the continuum model we show that it gives a good approximation for strongly converging economies. Our analysis draws on an interesting connection between continuous trading procedures and continuous time Markov chains."
The Simple Structure of Top Trading Cycles inSchool Choice
Jacob D. Leshno and Irene Lo April 25, 2017
Abstract: "Many cities determine the assignment of students to schools through a school choice mechanism. The prominent Top Trading Cycles (TTC) mechanism has attractive properties for school choice, as it is strategy-proof, Pareto efficient, and allows school boards to guide the allocation by specifying priorities. However the combinatorial description of TTC makes it non-transparent to parents and difficult for designers to analyze. We give a tractable characterization of the TTC mechanism for school choice: the TTC assignment can be simply described by n^2 admission thresholds, where n is the number of schools, and these thresholds can be easily observed after running the mechanism. To calculate these thresholds, we de fine TTC through trade balance equations. In a continuum model these equations correspond to a differential equation whose solution can give closed form expressions for the admission thresholds.
The model allows us to compute comparative statics, and evaluate welfare. As applications of the model we solve for optimal investment in school quality, explore the design of the priority structure, and provide comparisons between TTC and other school choice mechanisms that help explain empirical findings. To validate the continuum model we show that it gives a good approximation for strongly converging economies. Our analysis draws on an interesting connection between continuous trading procedures and continuous time Markov chains."
Thus Article The threshold structure of Top Trading Cycles (TTC) by Leshno and Lo
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