Explanation:

• Marginal physical product (MPP) is the change in the level of output due to a change in the level of variable input; restated, the MPP is the change in TPP for each unit of change in quantity of variable input.

• Total physical product (TPP) -- Quantity of output that is produced from a firm's fixed inputs and a specified level of variable inputs. So, by adding all the MPP, TPP can be derived.

Total Product

• In simple terms, we can define Total Product as the total volume or amount of final output produced by a firm using given inputs in a given period of time.

Marginal Product

• The additional output produced as a result of employing an additional unit of the variable factor input is called the Marginal Product. Thus, we can say that marginal product is the addition to Total Product when an extra factor input is used.

• Marginal Product = Change in Output/ Change in Input

• Thus, it can also be said that Total Product is the summation of Marginal products at different input levels.

• Total Product = ? Marginal Product