Small firms come along and they do their job really well, and they become large firms. That creates an opportunity for them to take advantage of consumers. The fundamental question is whether that is the world we still live in. Do we need to revise our priors about the power of entry, innovation and competition? In the short run, yes. But in the long run, no. Because a lot of entripanurs ere going to try and at first fail, but later succeed in solving it.