Value Addtion:

The difference between cost of materials and labor to produce a product, and the sale price of a product is the value added. In national accounts used in macroeconomics, it refers to the contribution of the factors of production, i.e., land, labor, and capital goods, to raising the value of a product and corresponds to the incomes received by the owners of these factors. The national value added is shared between capital and labor (as the factors of production), and this sharing gives rise to issues of distribution.