【Micro Seminar】The Local-global Equivalence on General Networks
2026/05/28
研討會日期 : 2026-05-28
時間 : 14:30
主講人 : Professor Wonki Cho
地點 : Conference Room B110
主持人 : Professor Gunhaeng Lee
主講人 : Dr. Wonki Cho received his Ph.D. in Economics from the University of Rochester in 2013. He is currently a Professor of Economics at Korea University. His research interests are Microeconomic Theory, Mechanism Design, and Social Choice Theory.
演講摘要 : Strategy-proofness is an incentive property requiring that no (preference) type gain by reporting any other type in a prespecified domain of admissible types. The "local-global equivalence (LGE)" refers to the equivalence of strategy-proofness and "local" strategy-proofness, which requires immunity to misrepresentation assuming that an agent is constrained to report “local” types relative to his true type. Generalizing an existing framework, we allow the notion of localness to be arbitrary and directed and hence manipulation opportunities to be asymmetric across types. We identify two conditions, each of which characterizes the networks satisfying LGE: (i) strong connectedness, a refined notion of connectedness; and (ii) Property DL, a directed-network adaptation of Property L by Kumar et al. (2021a). This characterization also helps reveal conditions for the random version of LGE (the equivalence of strategy-proofness and local strategy-proofness for random rules). We discover a necessary condition called hyper-connectedness and a sufficient condition called Property ULLO for random LGE. Our conditions are more general than earlier ones in the literature and are satisfied by several well-known preference domains. We also provide applications that can be covered uniquely by our results.
