理解仓位大小：不仅仅是买多少

Absolutely, position sizing is crucial. It's almost as if some folks believe their portfolio will magically protect itself from their own optimistic, albeit financially unsound, decisions. Funny how that never quite works out.

This is a really important point. I've been trying to get a better handle on position sizing myself, but it feels like there are so many variables. Are there any common mistakes you see people make when they try to implement a more disciplined approach?

"Protecting your capital" is definitely the key phrase. I find it's a lot easier to make rational decisions about position size when you're thinking about the potential loss rather than the potential gain. Nothing quite focuses the mind like the specter of a margin call.