Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.

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判断平台是否完成了可持续转型，可以通过一组剪刀差指标观察：一端是单位交易变现率的变化，另一端是供给侧的满意度指标，例如留存率或净推荐值。如果变现率持续上升，而供给侧满意度同步下滑，这种赚钱方式本质上仍是竭泽而渔。只有当两者同时改善，平台的转型才具备长期稳定性。

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