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Primary concepts placed in the open internet environment. Thursday, September 15, 2011. Friday, September 3, 2010. Value is a relative importance of a physical entity. Concept of exchange is that goods cannot be substituted but only exchanged to the other kinds of goods. Wednesday, September 1, 2010.

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Christakis, MD, PhD, MPH, is a sociologist and physician who conducts research in the area of biosocial science, investigating the biological predicates and consequences of social phenomena. He directs the Human Nature Lab. At Yale University, where he is appointed as the Sol Goldman Family Professor of Social and Natural Science, and he is the Co-Director of the Yale Institute for Network Science. Along with long-time collaborator, James Fowler. American Economic Review, 2014.