今天在 Statechery by Ben Thompson 上看到一篇关于固定成本和边际成本的更新，主要在谈Amazon Go，有几乎话浅显易懂，但很有道理，摘录下来。
…To understand the economics of tech companies one must understand the difference between fixed and marginal costs, and for this Amazon Go provides a perfect example…
- It was expensive to develop mainframes, but IBM could reuse the expertise to build them and most importantly the software needed to run them; every new mainframe was more profitable than the last.
- It was expensive to develop Windows, but Microsoft could reuse the software on all computers; every new computer sold was pure profit.
- It was expensive to build Google, but search can be extended to anyone with an Internet connection; every new user was an opportunity to show more ads.
- It was expensive to develop iOS, but the software can be used on billions of iPhones, every one of which generates tremendous profit.
- It was expensive to build Facebook, but the network can scale to two billion people and counting, all of which can be shown ads.
原文：https://stratechery.com/2018/amazons-go-and-the-future/