One volunteer spares the group; if all wait, catastrophe hits everyone. The bigger the crowd, the more each of us assumes someone else will step up — and fewer do.
Diekmann 1985; Darley & Latané bystander effect (1968).
payoff · Someone Has To #8977 Someone Has To: would you step up, or wait for someone else? █▁▁▁▁▁▁▁▁▁▁▁ 3 players · payoff.games
10 to play · One volunteer saves everyone — will it be you? · non-revealers forfeit their stake.