History of Economic thought.
Adam smith developed the labor theories of value to explain the relationship between the value attached to a commodity and the labor required to produce the item. According to Adam Smith, the value of a commodity is directly proportional to the amount of labor required to produce it. He says that the value of any product is attached to the labor used to make it. Labor refers to the efforts that a person puts in an activity to achieve some specific results.
Adam Smith gave the first definition...