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The '''Rendleman–Bartter model''' (Richard J. Rendleman, Jr. and Brit J. Bartter) in [[Mathematical finance|finance]] is a [[short rate model]] describing the evolution of [[interest rates]]. It is a "one factor model" as it describes interest rate movements as driven by only one source of [[market risk]]. It can be used in the valuation of [[interest rate derivative]]s. It is a [[stochastic asset model]].
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The model specifies that the [[instantaneous interest rate]] follows a [[geometric Brownian motion]]:
 
:<math>dr_t = \theta r_t\,dt + \sigma r_t\,dW_t</math>
 
where ''W<sub>t</sub>'' is a [[Wiener process]] modelling the random market risk factor. The drift parameter, <math>\theta</math>, represents a constant expected instantaneous rate of change in the interest rate, while the [[standard deviation]] parameter, <math>\sigma</math>, determines the [[Volatility (finance)|volatility]] of the interest rate.
 
This is one of the early models of the short term interest rates, using the same [[stochastic process]] as the one already used to describe the dynamics of the underlying price in [[stock options]]. Its main disadvantage is that it does not capture the [[mean reversion]] of interest rates (their tendency to revert toward some value or range of values rather than wander without bounds in either direction).
 
Note that in 1979 Rendleman-Bartter also published a version of the [[Binomial options pricing model]] . ("Two-State Option Pricing". Journal of Finance 24: 1093-1110.)
 
==References==
*{{cite book | author=Hull, John C. | title=Options, Futures and Other Derivatives| year=2003 | publisher = Upper Saddle River, NJ: [[Prentice Hall]] | isbn = 0-13-009056-5}}
*{{cite journal | author=Rendleman, R. and B. Bartter | title=The Pricing of Options on Debt Securities | journal=Journal of Financial and Quantitative Analysis| year=1980 | volume=15 | pages=11–24 | doi=10.2307/2979016}}
 
{{DEFAULTSORT:Rendleman-Bartter model}}
[[Category:Finance theories]]
[[Category:Interest rates]]
[[Category:Short-rate models]]

Latest revision as of 15:58, 15 June 2014

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