People hate seeing things out of stock. I presume that’s part of why they do it.
When a large retailer started (I believe it was Home Depot), one of the owner’s tactics was to go to the local competitor hardware store and buy up every single (insert item here). It might be light bulbs or paint brushes. Something very common that would cause people to be really annoyed to come in and see every one gone. That gave people an aversion to that store, because something was out of stock.
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