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Still, seller (and hugger) beware: Cunningham says in more than two decades of research on honesty, he’s found that about 25 percent of people are consistently honest in the way they behave, 25 percent mostly honest, 25 percent are dishonest, and 25 percent are erratic. “Even if most people do the right thing or add extra money to an honor till,” he says, “eventually somebody’s going to come along who tries to take all the cash.”

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