Furthermore, costly punishment did not increase the average payoff of the group.

此外，昂贵的惩罚不会增加群体的平均收益。

youdao

The company will give you a trade-in value for the used device, but it remains to be seen whether the delta between that and the payoff will, on average, be lower than the typical ETF.

ENGADGET: Editor's Letter: A not-so simple choice