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Trust reciprocity, a special form of link reciprocity, exists in many networks of trust among users. In this paper, we seek to determine the extent to which reciprocity exists in a trust network and develop quantitative models for measuring reciprocity and reciprocity related behaviors. We identify several reciprocity behaviors and their respective measures. These behavior measures can be employed for predicting if a trustee will return trust to her trustor given that the latter initiates adoi:10.1137/1.9781611972801.7 dblp:conf/sdm/NguyenLTJS10 fatcat:awseiazinrhc7moi2h4ekh7pau