Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
We study collective decisions by time-discounting individuals choosing a common consumption stream. We show that with any heterogeneity in time preferences, every Pareto efficient and non-dictatorial method of aggregating utility functions must be time-inconsistent. We also show that decisions made via non-dictatorial voting methods are intransitive. (JEL D71, D72, D91)