Derek Sivers makes a somewhat more extensive comment on the same point in "Anything You Want". There's a nice three-and-a-half-minute video based on it [1].<p>[1] <a href="https://www.youtube.com/watch?v=cfwwHa-7Ux8" rel="nofollow">https://www.youtube.com/watch?v=cfwwHa-7Ux8</a>