The law of reciprocity is a widely acknowledged psychological principle, and it goes like this: when somebody does something nice for, you have an instinctive, deep-seated desire to do something nice for them in return. Of course, this can go the other way as well—when somebody does something harmful to you, your instinct is to harm them in return.
The law of reciprocity is not limited to psychology. It is a principle used to explain behavior in a range of social science; it is applicable to pretty much all day-to-day human interactions, and that includes business interactions and public speaking situations as well.
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