Amazon massive economies of scale due to operating a highly efficient worldwide supply chain. I don't see Slack's average variable cost per unit going down in

Amazon massive economies of scale due to operating a highly efficient worldwide supply chain. I don't see Slack's average variable cost per unit going down in that same way. Amazon also made a lot of money on things like AWS by reinvesting, which is why they weren't profitable. They were burning that money by reinvesting it, not for operating expenses.