For stuff that people need and will buy at heavily inflated prices, sure. But there are a lot of non-essential items that people probably won't buy if the price increases significantly. And for those items, I suspect a lot of stores will just let the shelves stay empty instead of spending a lot of money for inventory they can't sell.
Candy bars for example. They want to charge $3 for a single candy bar now, but no one wants to pay that much so they're selling them 2 for $5.
But retailers have studied that this trick isn't going to last because not everyone wants to buy candy bars in bulk, and they won't spend more than $3 for a single candy bar, which means if it goes any higher they won't by any candy bars at all.
The customer will only bear so much, though, so at some point the businesses that keep buying stock and raising prices will be left with stock that cannot be priced any higher, leaving it to be unloaded at a loss. That can be a far worse situation than not having any stock at all. Either way, it is an uncomfortable gamble.
