How we change what others think, feel, believe and do
Touch them gently on the shoulder, arm or hand at a convenient point, in particular during financial transactions, such as when returning change.
The touch can be a deliberate attention-getting action or may an 'accidental' brushing.
If you are man, be more careful about this.
Touch creates human contact, momentarily creating a joining of identities. As they are now 'a part of you', giving you more money is like giving money to themselves.
Generally women touch more and a woman touching a man can have a romantic connotation. Male touch can have more difficult, as touching a woman who is with a man can make the man jealous, and touching a man can awaken homosexual fears. A man touching a woman can also be construed as an unwanted approach.
Of course there are parts of the body that you should not touch and this can vary with culture. The back and arms are safest.
A survey by Crusco and Wetzel (1984) showed that touching by waitresses increased tips and it did not matter where on the arm the customers was touched, nor did it matter what gender the customer was nor the type or style of restaurant. No touch led to a 12% tip. A touch on the shoulder gave a 14% tip. Best of all, touch on the palm of the hand gave a 17% tip.
The hand may well have worked best because it was skin-to-skin and symbolized holding hands, like very good friends.
Crusco, A. and Wetzel, C. (1984). The midas touch: the effects of interpersonal touch on restaurant tipping. Personality and Social Psychology Bulletin, 10, 512–517.
Kaufman, D. and Mahoney, J. M. (1999). The effect of waitresses’ touch on alcohol consumption in dyads. The Journal of Social Psychology, 139, 3, 261-267.
Stephen, R. and Zweigenhaft, R. (1985). The effect on tipping of a waitress touching male and female customers. The Journal of Social Psychology, 126, 1, 141-142.