But the rule for reciprocation, which states that those who give first are entitled to receive in return, - Robert B. Cialdini

With this single maneuver, Vincent engaged several important principles of influence. First, even those who did not take his suggestions felt Vincent had done them a favor by offering valuable information to help them order. Everyone felt grateful, and consequently, the rule of of reciprocation worked in his favor when it came time to decide on his gratuity. Besides hiking up the percentage of his tip, Vincent’s ploy also placed him in a position to increase the size of the party’s order. It established him as an authority on the current stores of the house: he clearly knew what was and wasn’t good that night. Moreover — and here is where seeming to argue against his own interests comes in — it proved him to be a trustworthy informant because he recommended dishes slightly less expensive than the one originally ordered. Rather than having appeared to try to line his own pockets, he seemed to have the customers’ best interests at heart.

When the newspaper detailed the suicide of a young person, it was young drivers who then piled their cars into trees, poles, and embankments with fatal results; but when the news story concerned an older person’s suicide, older drivers died in such crashes. l advised, then, to take special care in our travels at these times.

good-looking people are aware that other people’s positive evaluations of them are not based on their actual traits and abilities but are often caused by an attractiveness “halo