Correct Option: D

Price theory is also known as micro economics and is concerned with the economic behaviour of individual consumers, producers and resource owners. Prof. Leftwich defines Price Theory as “it is concerned with the flow of goods and services from business firms to consumers, the composition of flow and the evaluation of pricing of the component parts of the flow. It is concerned too with the flow of productive resources (or their services) from resource owners to business firms with their evaluation and with their allocation among alternative uses.”