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“Everybody kept telling them, ‘stop poking your nose where it doesn’t belong,'"
"A reactor is so vastly expensive and complicated that an average person cannot understand it, so one assumes that those who work on it understand it. On the other hand, everyone can visualize a cheap, simple bicycle shed, so planning one can result in endless discussions because everyone involved wants to add a touch and show personal contribution."
Source: https://en.wikipedia.org/wiki/Law_of_triviality#Argument
A brick-and-mortar mall likely could not compete with such low prices and so your online sales would probably not warrant the initial investment in setting up ecommerce.
People don't attend brick-and-mortar malls for low prices, they attend for the experience, to try clothes on, maybe buy a few small items and to have a milkshake all whilst only needing cash, no terms of service involved. If you focus on improving the experience of shopping at a mall, it doesn't matter what your prices are, you will likely receive a higher return than if you invested that same money in ecommerce.