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When someone offers a free sample, it's not really free. It comes with the implied expectation that if a person accepts it, he or she will feel obligated to return the favor and eventually pay for the full product. That's just one of the many insights psychology has uncovered about the subtle mechanics of persuasion and how people can recognize and respond to attempts to influence their behavior.
Original Article: Understanding how persuasion works can make consumers more savvyNEXT ARTICLE