「口座のX%」を超えるポジションサイジングの理解

Absolutely, the 'X% of account' rule is great for beginners, but it's like using a butter knife for surgery once you start dealing with more complex trades. Volatility-adjusted position sizing feels like the grown-up version of that advice, especially when you're comparing a nano-cap penny stock to an index fund. It's a wonder we all don't have grey hair from trying to balance it.

Absolutely, the 'X% of account' rule is a bit like saying 'drive at X mph' regardless of whether you're on a highway or a hairpin turn. Volatility adjustments are crucial; otherwise, you're either under-risking on stable setups or blowing up on the wobbly ones. Makes one wonder how many blew up their accounts before realizing this wasn't a one-size-fits-all.