As always, this is a good rule to follow, but you have to be careful to watch out. The last time I bought some Tylenol, I went to a local pharmacy and scanned

As always, this is a good rule to follow, but you have to be careful to watch out. The last time I bought some Tylenol, I went to a local pharmacy and scanned the shelves for the price/count combination. The name brand Tylenol was a 100 tablet container. Sitting adjacent to it was the generic Tylenol store brand. Exact same physical size container. Twenty five cents less price as marked on the shelf. Looking more closely, the identical physical size container of generic contained 50 tablets (of identical tablet size to the 100 tablet name brand Tylenol). The end result, due to the price mis-match, is that the name brand was actually nearly half the cost of the generic (because one got 2x the pills for 25 additional cents). I've noticed this effect in grocery stores as well. Often the lowest unit cost item is the middle of three sizes. The small container is larger unit cost because the packaging contributes a larger percentage of the total price. The large "bulk" container (which should be lowest unit cost) often is not. The only valid reason I have deduced for why is the stores trying to take advantage of people who "grab the bulk size because it's cheaper" without actually looking at the true costs.