 The result is that a theorist deploying the Price Equation may treat as drift (that is, quantify as deviation from expectation) what a theorist deploying type recursions must treat as selection (quantify by fitness variables). It is possible to make assumptions using the Price Equation such that the drift term quantifies what is quantified by the drift term in type recursions, but nothing about the Price Equation proper forces one to do this, and indeed proponents of the Price Equation, such as Grafen (2000), tout how the drift term in the Price Equation may quantify all sorts of randomness, explicitly including randomness that is not quantifiable as drift in type recursions.