Zakon vrijednosti i oblici njegova djelovanja u socijalističkoj samoupravnoj robnoj proizvodnji
Price law is the theoretical expression of the relation between the value of the product and the quantity of labour. This relation is one of the basic law of goods production. In different types of production the principle is manifested in different forms. In the simple production of goods prices tend to conform to the value of the goods. In the classic form of capitalism the principle operates through the law of average profit. The transfer of capital to different branches of economy ultimately results in a price which comprises the cost of production and average profit. At the monopoly stage prices comprise the cost of production, average profit, and the extra profit As regards the socialist self-governing goods production such as exists in Yugoslavia, different opinions are current concerning the forms of operation of this principle. Two principal variants are prevalent: the principle of average income and the principle of specific cost of production.