Why do we punish takers for being unfair? It’s not spite. We’re not getting revenge on takers for trying to take advantage of us. It’s about justice. If you’re a matcher, you’ll also punish takers for acting unfairly toward other people. Gretchen Rubin calls matchers the “karma police.” In another study spearheaded by Kahneman, people had a choice between splitting $12 evenly with a taker who had made an unfair proposal in the past or splitting $10 evenly with a matcher who had made a fair proposal in the past. More than 80 percent of the people preferred to split $10 evenly with the matcher,
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