(a) As a guide to determining the minimum prices of milk to be paid to producers and producer-distributors, the board shall take into consideration the following items based on the operations of a reasonably efficient producer:

(1) The price to producers necessary to assure the production of an adequate supply of wholesome milk for the market.
(2) The price necessary to return to the producer, the producer’s cost of production, plus a fair return on the producer’s invested capital, the producer’s family labor and the producer’s management skills.
(3) The costs incurred in obtaining, feeding, managing and maintaining dairy animals at optimum production capacity.
(4) The prevailing wages and perquisites of employees.
(5) The ordinary fixed charges and operating expenses incident to the ownership, operation and management of the dairy.
(b) In establishing minimum prices for milk under this chapter, the board shall further consider the effect thereof on the consumer.