A Test of the Law of Demand in a Virtual World: Exploring the Petri Dish Approach to Social Science. - Edward Castronova; Mark W. Bell; Robert D. Cornell; James J. Cummings; Will Emigh; Matthew Falk; Michael Fatten; Paul LaFourest; Nathan Mishler (Int. J. Gaming Comput. Mediat. Simulations, 2009)