John Fraser Muth (/mjuːθ/; September 27, 1930 – October 23, 2005) was an American economist. He is known as "the father of the rational expectations revolution in economics", primarily due to his article "Rational Expectations and the Theory of Price Movements" from 1961.Muth earned his Ph.D. in mathematical economics from Carnegie Mellon University, and was in 1954 the first recipient of the Alexander Henderson Award.