Costco also sells in much larger sizes, so while the price may be lower on a per unit basis, you often pay more overall. It’s a trade not everyone wants, e.g. l

Costco also sells in much larger sizes, so while the price may be lower on a per unit basis, you often pay more overall. It’s a trade not everyone wants, e.g. lack of space to store bulk goods in a small apartment. Costco, Target, Amazon, et al compete on some sort of n-dimensional plane with price, size, shopping experience, brand, etc all play a part. It’s not a line.