Researchers conducted an experiment published in the journal Psychological Science in which they had a group of subjects perform some stretching exercises (under the pretense that they were really studying the effects of stretching) and then randomly selected them to adopt either wide or contracted postures.
Prior to the commencement of the exercise, the participants were told they would be paid $4, but after the stretching exercises, the researchers deliberately overpaid them $8 in a way that looked like a mistake (by throwing in a $5 bill). Seventy-eight percent of the people who were put in the big, expanded, confident body positions kept the money. Only 38 percent of the other group did.
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"You certainly seem like a bold, confident young woman. Get lost, we don't hire thieving bastards here."
This effect might also explain another phenomenon close to our hearts -- why people who drive SUVs are such insufferable, reckless douches on the road. In another experiment, researchers recruited 71 subjects and sat them in realistic driving simulators, some with large seats like in an SUV or truck, and some with cramped seats like in a VW Beetle. Sure enough, the drivers in the large seats tended to drive more recklessly and were more likely to commit hit-and-runs rather than stop according to the rules.