Theory of Homogeneity
With respect to the long-term process of trade of economic merchandizes, two elements of desirability and uniqueness/scarcity will increase the process of supply and demands
First explanation: Because of knowledge enhancement and science and technology improvements, in the production function more desirable and valuable commodities with will be produced.
second explanation is that what is meant by desirability? The value of a thing is connected with its usefulness and aptness.
Why the value of an old stone is more than a piece of bread. For this there is an essential relation between increase and decrease of value and scarcity and superfluity of a thing. (James Balmez Cataloniaye)