17077. In any action or prosecution for sales below cost in violation of this chapter, if the defendant acquires his raw materials for a consideration not wholly or definitely computable in money, the cost of the raw materials shall be presumed to be the prevailing market price for similar raw materials in the ordinary channels of trade in the locality or vicinity in which such raw materials were acquired, at the time of the acquisition.
(Added by Stats. 1941, Ch. 526.)