On the economies of scale…

I just out of the pharmacy, and I was wondering why I was given 7 vials of insulin. And at least 3 months for my other meds. Then it occurred to me: it's just like Costco. The more you buy at once, the lower the unit price becomes. Sometimes even if you have no health insurance, it does pay to scale up. And there are pharmacies that are cheaper than Wally World. And they happen to be in walking distance of my house, too.