To be fair, there are just as many books and “investment gurus” out there trying to convince you that you can beat the market if you follow their advice. Your “

To be fair, there are just as many books and “investment gurus” out there trying to convince you that you can beat the market if you follow their advice. Your “rule” might seem obvious for those who already implement it, but it’s actually difficult for many people to follow because it requires having a certain level of both self-awareness and knowledge of investing. And, while most of the consequences of poor investment strategies do fall on individuals - at least superficially, both the hyper-social nature of our species and the political/economic structure of our societies ensure that those consequences frequently extend far beyond them.