Everyone in business would know the economies of scale. Otherwise how else would Dollar Stores make money with the prices they are charging for the kind of products they have.
Every business from the neighbourhood mini-market to corner candy stores to bigger disc duplication outfits can benefit from buying supplies in bulk. If the supplies are non-perishable, so much the better.
When stores buy in bulk, they will also generate savings for the customer by pricing their wares lower.