marginalism (?m??d??n??l?z?m) n (Economics) the economic theory that the value to the final user is the true value of the productCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014