Social Choice and Welfare Vol. 20, Issue 3, Pages 267-275 June 2003 HKS Authors See citation below for complete author information. Mathias Risse Director of the Carr Center for Human Rights Policy Berthold Beitz Professor in Human Rights, Global Affairs and Philosophy Citation Hild, Matthias, Richard C. Jeffrey, and Mathias Risse. "Flipping and Ex Post Aggregation." Social Choice and Welfare 20.3 (June 2003): 267-275.