Charles Duhigg

There is a woman named Wendy Wood, who did a study when she was at Duke, and she followed around college students to try to figure out how much of their day was decision-making versus how much was habit. And what she found was that about 45 percent of all the behaviors that someone did in a day was habit.

As homeowners see the value of their homes decline, they become more likely to delay purchases of the big items - like automobiles, electronics and home appliances - that are ballasts of the American economy. When those purchases decline, large manufacturing firms, suddenly short on funds, could begin laying off employees.

As someone who came to New York in the 1970s, I was, like so many of my friends, a certified member of what we now call the 99 percent - and I was a lot closer to the bottom than to the top of that 99 percent. At some point during the intervening years, I moved into the 1 percent.