A social choice function is group strategy-proof on a domain if no group of agents can manipulate its final outcome to their own benefit by declaring false preferences on that domain. There are a number of economically significant domains where interesting rules satisfying individual strategy-proofness can be defined, and for some of them, all these rules turn out to also satisfy the stronger requirement of group strategy-proofness. We provide conditions on domains guaranteeing that for all rules defined on them, individual and group strategy-proofness become equivalent. We also provide a partial answer regarding the necessity of our conditions. © 2010 Elsevier Inc.
|Journal||Journal of Economic Theory|
|Publication status||Published - Sept 2010|
- Group strategy-proofness
- Separable preferences
- Sequential inclusion
- Single-peaked preferences