David R. Henderson is the editor of The Concise Encyclopedia of Economics (2003) (formerly The Fortune Encyclopedia of Economics (1993). He is a research fellow with Stanford University’s Hoover Institution and an associate professor of economics at the Naval Postgraduate School in Monterey, California. He was formerly a senior economist with the President’s Council of Economic Advisers.
Ludwig von Mises: "Interest is the difference in the valuation of present goods and future goods; it is the discount in the valuation of future goods as against that of present goods." - Planning for Freedom