What was Adam Smith's theory of value?

Smith believed that the Word value has two different meanings, and sometimes expresses the utility of some particular object, and sometimes the power of purchasing other goods which the possession of that object conveys. The one may be called "value in use"; the other, "value in exchange." The things which have the greatest value in use have frequently little or no value in exchange; and on the contrary, those which have the greatest value in exchange have frequently little or no value in use. Nothing is more useful than water: but it will purchase scarce any thing; scarce any thing can be had in exchange for it. A diamond, on the contrary, has scarce any value in use; but a very great quantity of other goods may frequently be had in exchange for it. Because Smith was somewhat confused about the factors determining relative prices, he developed three separate theories relating to them. (1) a labor cost theory of value, (2) a labor command theory of value, and (3) a cost of production theory of value. He postulated two distinct states of the economy: the early and rude state, or primitive society, which is defined as an economy in which capital has not been accumulated and land is not appropriated; and an advanced economy, in which capital and land are no longer free goods (they have a price greater than zero).