Your posts are moderated. Average product and marginal product: Average product (AP) is the output per unit of the variable factor employed. In other words, it is the productivity of the variable factor (VF). It is measured by dividing total product (TP) by amount of variable factor employed.i.e.verage product and marginal product: Average product (AP) is the output per unit of the variable factor employed. In other words, it is the productivity of the variable factor (VF). It is measured by dividing total product (TP) by amount of variable factor employed. i.e.