Cialdini raamat
Van Holwyk 8{ Maher, 2000; Warriner, Goyder, Gjertsen, Horner, 8{ McSpurren,
1996). Indeed, one study showed that mailing a $5 "gift" check along with an insur-
ance survey was twice as effective as offering a $50 payment for sending back a
completed survey (James 8{ Bolstein, 1992). Similarly, food servers have learned that
simply giving customers a candy or mint along with their bill significantly in-
creases tips (Strohmetz, Rind, Fisher, 8{ Lynn, 2002). In general, business operators
have found that, after accepting a gift, customers are willing to purchase products
and services they would have otherwise declined (Gruner, 1996).
It appears that the give-and-take of social interaction is recognized well before
adulthood. One fifth-grade language teacher wrote to me about a test she gives her
students on the proper use of the past, present, and future tenses. To the question,
annaabi.ee 
