This is the effort cost. Similarly, player II, everything's symmetric here Player II's payoff is the same thing.

这是她的努力成本,由对称可得,参与人II的收益是一样的

耶鲁公开课 - 博弈论课程节选

At the margin, I'm reaping, I'm bearing the cost for the extra unit of effort I contribute, but I'm only reaping half of the induced profits of the firm, because of profit sharing.

从边际角度分析,我承担了多付出的全部边际成本,但我却只能得到一半的边际收益,因为利润是均分的

耶鲁公开课 - 博弈论课程节选