> "How can this optimism be justified? Not on the basis of specific future technologies—which, again, are unproven—but on the basis of philosophical premises ab

> "How can this optimism be justified? Not on the basis of specific future technologies—which, again, are unproven—but on the basis of philosophical premises about the nature of humans and of progress." The premise is "optimists make money" but if there is no clear understanding of where the next technological breakthrough will come from, then it seems like the author is suggesting just going long on the S&P500? The Wilshire 3000? That's hardly anything revolutionary and won't make you anymore money than your peers around who'd also employ the same tactic, not because they had a philosophical enlightment but because their wealth manager at whatever bank produced for them the most classic 60-40 equities-bonds portfolio. We all like an optimist article about optimism but can we focus on the making money part? Maybe using leverage on the S&P500 when there are signals of a breakthrough? But again, if you can't predict the company or even the industry it would come from then how do you know to be on the cusp? It reads like something like: BS-ing yourself into believing your own hype and go on a binge of irrational exhuberance based on philosophy and past breaktrhoughs which happened when everything seemed static and decaying...so they will happen again at some point in some sector of the economy.