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Your brain evolved to hoard supplies and shame others for doing the same

Catesby Holmes writing in The Conversation:

The media is replete with COVID–19 stories about people clearing supermarket shelves – and the backlash against them. Have people gone mad? How can one individual be overfilling his own cart, while shaming others who are doing the same?

As a behavioral neuroscientist who has studied hoarding behavior for 25 years, I can tell you that this is all normal and expected. People are acting the way evolution has wired them.