"It is really about the unequal distribution of the reward, " Range said. "If it was only about frustration they would stop at the same time."

“这实际上是关乎于奖赏分配之不平等的，”瑞治说，“如果仅仅是挫败感让狗做出这样的反映，那么他们在之后的单独测验中不会表现出这样的不同，而应该是和之前差不多同时停下来拒绝合作的。”

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One of the most common cheats, and the hardest to stop, is that of unequal information.

ECONOMIST: How to cheat at games