Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Recently, a trend has developed around the world for referenda to be used to determine binary social decisions. In a couple of setups, we prove impossibility results of the following form: a binary social goal can be achieved via a referendum if and only if it is dictatorial. Hence, our results challenge the conventional wisdom in social choice theory that social decisions are permissive in two-outcome environments (May's Theorem).