jeffrey kluger is "time" magazine's senior editor and lisa bragg is a psychologist.rve, people who are most stressed are the people in the lower income category which is very understandable. >> the desperation quotient. >> the middle income not as stressed but when you get back to the higher income the stress level goes back up. why is that? >> it is true there but it is also true across all income spectrums. as you climb, certain responsibilities, certain pressures that weren't a part of your life beforehand begin to accumulate. you're responsible for other people which is a deeply, deeply challenging thing to do because you have lives in your hands. the expectations for the kind of work you're going to be doing and for your availability is greater. you also have what are called microimpression management activities which is just a gobbledy-gook way of saying suddenly you have to worry about what you're wearing, where your kids are going to school. all of these things are the sort of prices of being successful. >> and you may not have the tools to deal with that sor