When the notion of “stress” was crafted in the mid-twentieth century, the emphasis was on the health of executives, whose anxieties presumably outweighed those of a manual laborer who had no major decisions to make. It turns out, however, that the amount of stress one experiences—measured by blood levels of the stress hormone cortisol—increases as you move down the socioeconomic scale, with the most stress being inflicted on those who have the least control over their work.
