Not all debt is bad. From time to time we should get into debt when there's a good reason for that.

Big Data is like teenage sex: everyone talks about it, nobody really knows how to do it, everyone thinks everyone else is doing it, so everyone claims they are doing it.

Scaling down individually is very hard. Imagine that if you go to a place where everybody is dressed nicely, and you are the only one who doesn't dress nicely. Everybody goes on vacations to a great place and you go to the Jersey shore. It's very hard to do these things without an organized mechanism, but it looks to me like there might be some organized mechanisms.

Money are very difficult to think about. So, we think about money as the opportunity cost of money. So, we at some point went to a Toyota dealership and we asked people, what will you not be able to do in the future if you bought this Toyota?

Money is all about opportunity cost. Every time you spend on something, that's something you can't spend on something else.

Dishonesty is all about the small acts we can take and then think, 'No, this not real cheating.' So if you think that the main mechanism is rationalization, then what you come up with, and that's what we find, is that we're basically trying to balance feeling good about ourselves.

What you should do is wait until the end of each month, and then say, "OK, how much money do I have? How much do I need? Let me send the rest to retirement."