The authors thank the department editor, the anonymous associate editor, and the reviewers for their constructive feedback. A preliminary version of this work appeared as an extended abstract in the proceedings of the 21st ACM Conference on Economics and Computation (EC’20), and we are grateful to the anonymous reviewers and conference participants for their valuable comments. The third author gratefully acknowledges the Simons Institute for the Theory of Computing, as this work was done in part while the author attended the program on Online and Matching-Based Market Design.