This idea made Elizabeth Warren famous. It was quite a profound finding. Well, I should speak for myself, when I first red the synopsis of the Two Income Trap it really felt like a slap on the head. It felt it was counter-intuitive, yet explains so much shiftily looking at own's family spending habits.

I also found the book's message darkly subversive sometimes. For example, all things being equal, it is better to spend more of your income on luxuries than on he biggies (housing, transportation, debt). If you do the former, you can easily roll back. If you do the latter, when times get tough, you're hosed. In yo face papaa!