Walmart sales dropped because they tried to move away from their low prices and they cutback the number of brands they carried drastically, hoping consumers would just buy whatever brand walmart chose to carry, which they found out the hard way this wasn't the case. They didn't have that much control over their shoppers, yet.
So now they reversed course and are adding back all the brands and refocused on their low prices.
Walmart now also matches any grocery store so you can just walk in and get their prices.
Walmart is also moving towards a cashierless system and has been testing it in several markets for several months now.
What they are doing is having all their suppliers put rfid tags on the products. This way you can fill your cart up, pay at a pay station or on their smartphone app, and just leave. It leads to them saving on cashier costs(though they claim they will be redeployed throughout the store) and more important to them, is it elimiantes shrink entirely, since you can't walk out of the store if the tag hasn't been paid for.
It's the future of shopping, and walmart is leading the innovation on this front.
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There are no stupid questions, but there are a lot of inquisitive idiots
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When you try to please everybody, you end up pleasing nobody