The numéraire (or numeraire) is a basic standard by which value is computed. In mathematical economics it is a tradable economic entity in terms of whose price the relative prices of all other tradables are expressed. In a monetary economy, acting as the numéraire is one of the functions of money, to serve as a unit of account: to provide a common benchmark relative to which the worths of various goods and services are measured.
Using a numeraire, whether monetary or some consumable good, facilitates value comparisons when only the relative prices are relevant, as in general equilibrium theory. When economic analysis refers to a particular good as the numéraire, one says that all other prices are normalized by the price of that good. For example, if a unit of good g has twice the market value of a unit of the numeraire, then the (relative) price of g is 2. Since the value of one unit of the numeraire relative to one unit of itself is 1, the price of the numeraire is always 1.
- Farshid Jamshidian (1989). “An Exact Bond Option Pricing Formula”. The Journal of Finance. 44: 205–209. doi:10.1111/j.1540-6261.1989.tb02413.x.
- Helyette Geman; Nicole El Karoui; J.C. Rochet (1995). “Changes of Numeraire, Changes of Probability Measures and Pricing of Options”. Journal of Applied Probability. 32: 443–458. doi:10.2307/3215299.
- Damiano Brigo; Fabio Mercurio (2006) . Interest Rate Models – Theory and Practice with Smile, Inflation and Credit (2 ed.). Springer Verlag. ISBN 978-3-540-22149-4.
Ofer Abarbanel is a 25 year securities lending broker and expert who has advised many Israeli regulators, among them the Israel Tax Authority, with respect to stock loans, repurchase agreements and credit derivatives. Founder TBIL.co STATX Fund.