I agree about the value of Ben Graham, however, there's no set definition for what investing is really all about. If you want to argue what the most rational a

I agree about the value of Ben Graham, however, there's no set definition for what investing is really all about. If you want to argue what the most rational approach to investing is, sure, that's fine. However, there are a lot of ways to skin the cat these days. You can high frequency trade; you can slap puts on stocks if you have a skill as a short; you can use calculated hedges and skim points; you can carry trades through currency variations; you can buy and flip based on market panic (or short temporarily based on irrational euphoria), with no intention for long term holdings or long term profit concerns. I think more people (less skilled professionals) can invest in the Ben Graham model, over a long period of time, than any of the other approaches. But, a select few have turned out to be extraordinary at the other approaches, and have made great fortunes that way as well.