It seems to be a measure intended to prevent hoarding. As people are snatching up as many essentials as they can buy, hoarding everything from bottled water to toilet paper, prohibiting returns is a way of warning people that if they buy more than they need, they'll have to hold on to it.

Costco is taking other measures to prevent their shelves from going bare by only allowing shoppers to buy two of everything.

While this may seem extreme to some, such policies ensure that shortages don't occur. As more and more people panic-buy more supplies than they need, stores are having a hard time keeping their shelves stocked, but it's not because there is a shortage of products. Instead, people are buying more than they need simply because everyone else is doing it. "This creates a sense of urgency and leads people to over-buy, that is buying more supplies than they really need, just to be on the safe side," clinical psychologist Steven Taylor told NBC. "This can create real shortages because people buy more than they need."