I don't remember where I read this (or heard it) but someone said getting rich is easy: either be the best at something or be second best at two things. The phr

I don't remember where I read this (or heard it) but someone said getting rich is easy: either be the best at something or be second best at two things. The phrasing is obviously just a little too neat but the point makes sense to me - someone that knows a few things very very deeply is just as valuable as the most knowledgeable about some (other) niche thing. Jumping around is fun (for a little while) but depth is what people really pay for eg how much could you charge if you could squeeze the last bit of latency out of some design that gives a firm an edge against their competitor. I'm sure people will claim that most business doesn't hinge on the margins and maybe that's true but there definitely are businesses that do.