Technology is probably the single biggest driver of productivity gains for the developed countries. For example, I think it's much more important than free trade.

Consider the trivial but revealing hallmarks of urban hipsterdom: faux vintage photography, the handlebar mustache, and vinyl record players all hark back to an earlier time when people were still optimistic about the future. If everything worth doing has already been done, you may as well feign an allergy to achievement and become a barista.

If they don't go to law school, bright college graduates head to Wall Street precisely because they have no real plan for their careers.

When you already have $150 billion a year in revenues from the iPhone, it's very hard to come up with any new vertical that will sort of move the dial. And there's this sort of weird effect where the larger a company gets, the harder it is to come up with any new product that really moves the dial.

Value investors look at cash flows. If a company can maintain present cash flows for 5 or 6 years, it’s a good investment. Investors then just hope that those cash flows - and thus the company’s value - don’t decrease faster than they anticipate.

The lowest-hanging fruit in preventative medicine is just to really focus on nutrition.

In a world where wealth is growing, you can get away with printing money. Doubling the debt over the next 20 years is not a problem.