20 flaws, biases, and causes of bad behavior...

" ... investing is not the study of finance. It’s the study of how people behave with money. And behavior is hard to teach, even to really smart people. You can’t sum up behavior with formulas to memorize or spreadsheet models to follow. Behavior is inborn, varies by person, is hard to measure, changes over time, and people are prone to deny its existence, especially when describing themselves."

-Morgan Housel, from this read-worthy essay, The Psychology of Money