Black-Scholes is a know-nothing system. If you know nothing about value - only price - then Black-Scholes is a pretty good guess at what a 90-day option might be worth. But the minute you get into longer periods of time, it's crazy to get into Black-Scholes. For example, at Costco we issued stock options with strike prices of $30 and $60, and Black-Scholes valued the $60 ones higher. This is insane.
Charlie MungerYou don't have to be brilliant, only a little bit wiser than the other guys, on average, for a long, long, time.
Charlie MungerI never allow myself to have an opinion on anything that I don't know the other side's argument better than they do.
Charlie MungerWhenever you think something or some person is ruining your life, it's you. A victimization mentality is so debilitating.
Charlie MungerBerkshire's whole record has been achieved without paying one ounce of attention to the efficient market theory in its hard form. And not one ounce of attention to the descendants of that idea, which came out of academic economics and went into corporate finance and morphed into such obscenities as the capital asset pricing model, which we also paid no attention to. I think you'd have to believe in the tooth fairy to believe that you could easily outperform the market by seven-percentage points per annum just by investing in high volatility stocks.
Charlie Munger