Introduction: In the context of measuring changes, the notion of partial marginality is used in economics to indicate the partial derivative.
Definition: In economics the partial derivative z′x(x,y) is called the partial marginal change of z(x,y) with respect to x. Similarly, the partial derivative z′y(x,y) is called the partial marginal change of z(x,y) with respect to y.
Definition: In economics the partial derivative z′x(x,y) is called the partial marginal change of z(x,y) with respect to x. Similarly, the partial derivative z′y(x,y) is called the partial marginal change of z(x,y) with respect to y.