Marketing is all about providing information that will heighten someone's anticipated and real pleasure.

The problem with opportunity cost is that opportunity cost is divided among many, many things.

I don't think we should go around life and being miserable all the time and feel the pain of paying. It's a question of what categories we want to spend more on and what categories we want feel that we are spending too much on and we want to cut down.

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

I think we could get people to both be more productive and happier. We're less productive as individuals. We're less productive as companies, and we're more miserable.

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."

We're actually trying to develop an iPhone app, now that the Droid is out, we'll do it for that as well, if we ever learn how to program on this thing. But the idea is that to make money concrete. So, you can do this app, and it's not out there, but you can do the app. And you say, "I like vacation in the Bahamas, shoes, lattes, and books." And now, when you are tempted to buy something, that thing translates in terms of the things you are interested in.