who share with others, even if they do not receive the item. Psychologists Ken J. Rotenberg and Luanne Mann have also explored the development of the reciprocity norm of self-disclosure and its functions in children’s attraction to peers. The findings have indicated that the norm of the reciprocity is involved in attraction to peers only by six-grade; children of this year group showed such effect by reporting greater affection towards others who reciprocated the same amount of intimacy than those whose intimacy level deviated from the initiator’s. According to Youniss's (1980) theory of social development, children's friendship during the early part of middle childhood (5–8 years) is based upon the reciprocity of behaviour that suggests a "tit-for-tat" rule of exchange and interaction. During the later part of middle childhood (9–11 years) and beyond, children's friendship is based on the reciprocity of behaviour that suggests a mutually cooperative principle of exchange as well as an appreciation of reciprocity. Studies A study was done in 2000 that consisted of 116 MBA students enrolled in a part-time MBA program at a business school, in the north east of the United States (Chen, 2009). The study consisted of two parts, the first part was to complete a series of self perception questions, which included the measure of the relational-self orientation (Chen, 2009). The second part was to complete a work relationship exercise during a class session 6 weeks later than the first task. "In the exercise, participants read a vignette in which they were asked to imagine that they were the focal person in a reward allocation scenario at work" (Chen, 2009). They were then told that they worked hard on the project together with a colleague, and made the same sort of effort and contribution to the project. Their supervisor then agreed to give $1000 reward. They were then given the following options on how to divide the money: (A) Your colleague will make a proposal as to how the money should be divided. (B) If you accept the proposal, then you will get what the colleague proposed to you. However, if you reject it, then the money will return to the company for future reward considerations. Measures were calculated on how many people would reject the proposal or accept the proposal. And the results were positively and negatively skewed. If the two persons were close friends or colleagues the acceptance rate was