MARGINAL PHYSICAL PRODUCT: The change in the quantity of total product resulting from a unit change in a variable input, keeping all other inputs unchanged. Marginal physical product, usually abbreviated MPP, is found by dividing the change in total product by the change in the variable input. Marginal physical product usually goes by the shorter name marginal product. See also | marginal product | variable input | fixed input | total physical product | marginal productivity theory | law of diminishing marginal returns | marginal revenue product | average physical product | total product |
