Total product (total product: TP) refers to the total output that can be produced from the variable number one, with fixed factors existing in the moment.
yield (average product:AP) means the number of output has easy-to-use variable factors 1 unit, which is combined the output divided by the number of variable factors using
marginal product. (marginal product:MP) refers to the total output change when using variable factors change 1 units.