Proceedings of 4th Global Business and Finance Research Conference 25 - 27 May 2015, Marriott Hotel, Melbourne, Australia ISBN: 978-1-922069-76-4 The Impact of Psychological Ownership on Defending Organization: A Social Exchange View Yijing Lyu*, Chun Hui**, BangCheng Liu*** and Cynthia Lee**** We examined the relationship between psychological ownership and employees’ defending organization behavior. Employing social exchange theory, we explain the mediating role of felt obligation in the relationship. We further examined the moderating role of past-positive time orientation in the effects of psychological ownership on felt obligation. Using timelagged data from 12 branches of two hotels in China, we found that psychological ownership positively affected employees’ defending organization behavior via felt obligation. In addition, our findings indicated that past-positive time orientation moderated the positive relationship between psychological ownership and felt obligation such that the positive relationship was stronger when past-positive time orientation was low rather than high. Moreover, past-positive time orientation moderated the indirect effect of psychological ownership on defending organization’s performance via felt obligation such that the indirect effect is stronger when past-positive time orientation is low rather than when it is high. The theoretical and managerial implications of these results are discussed. Field of Research: Management (JEL: M1) ________________________ Ms Yijing Lyu, School of Tel: (86) 1822-1868-198. Management, Fudan University, China, Email : lyuyijing@163.com, **Prof. Chun Hui, Faculty of Business and Economics, University of Hong Kong, Hong Kong, Email:chui@business.hku.hk. Tel: (852) 3917-5138 ***Dr. Bangcheng Liu, School of International and Public Affairs, Shanghai Jiao Tong University, China. Email: liubangcheng@sjtu.edu.cn, Tel: (86) 21 6293 237. ****Prof. Cynthia Lee, College of Business Administration, Northeastern University, USA and Department of Management & Marketing, Hong Kong Polytechnic Universit, Hong Kong, Email: msclee@polyu.edu.hk, Tel: (1) 617-373 5146. _______________________________ Acknowledgement: The work described in this paper was supported by a grant from Hong Kong Research Grants Council (HKU 791013) to Chun Hui and Cynthia Lee.