Any advertising, offer to sell, or sale of any merchandise, either by retailers or wholesalers, at less than cost as defined in this chapter, which has the intent or the effect of inducing the     purchase of other merchandise or of unfairly diverting trade from a competitor or otherwise injuring a competitor, impairs and prevents fair competition, injures public welfare, and is unfair competition and contrary to public policy and the policy of this chapter, if the result of such advertising, offer, or sale is to tend to deceive any purchaser or prospective purchaser, or substantially to lessen competition, or unreasonably to restrain trade, or to tend to create a monopoly in any line of commerce.