Even more importantly, new ideas - the building blocks of intellectual property - almost invariably build on old ideas in ways that are difficult or impossible to trace. From an economic perspective, this provides a rationale for making calculus, developed initially by Leibnitz and Newton, freely available, despite the fact that those insights have immeasurably increased wealth over the generations.
Werning, Iván (2012). “Managing a Liquidity Trap: Monetary and Fiscal Policy,” unpublished paper, Massachusetts Institute of Technology, March. Yellen, Janet (2011). “Unconventional Monetary Policy and Central Bank Communications,” speech delivered at the University of Chicago Booth School of Business U.S. Monetary Policy Forum, New York, New York, February 25. ———.