Chen, Chia-Hui, Hongliang Zhang, Marco Migueis, Monica Martinez-Bravo, Peter Schnabl, Rongzhu Ke, and William Wheaton. 14.01 Principles of Microeconomics,Fall 2007. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 19 Jun, 2013). License: Creative Commons BY-NC-SA

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