People are more likely to do favors again when their favors are followed by thank-yous than when followed by yelling. This is an example of

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The law of effect, a principle developed by Edward Thorndike, suggests that behaviors followed by pleasant outcomes are more likely to be repeated, while those followed by unpleasant outcomes are less likely to be repeated. In this scenario, receiving a thank-you makes it more likely for the favor to be repeated, illustrating the law of effect.

People Are More Likely to Do Favors Again When Their