Behavioral economics believes that reciprocal behavior is a kind of conditional cooperation behavior, which is the return of goodwill and helpful behavior. Reciprocal behavior allows the other party to gain benefits through the implementation of repaying, which is often achieved by reducing or damaging self-interest.
According to the above definition, which of the following is reciprocal behavior?
In order to thank her colleague for saving her child who fell into the water, Li Ling gave up the opportunity to get a promotion and raise her salary.