Any arrangements, contracts, and agreements that may be made by any corporation or person, or by and between its agents and subagents, to sell and market its products and articles, manufactured in this state, or imported into this state, to any producer or consumer at prices reduced below the cost of production or importation into this state, including the cost of marketing, and a reasonable and just marginal profit, to cover wages or management, and necessary incidentals, as is observed in the usual course of general business, and the continuance of such practice under such contracts and arrangements for an unreasonable length of time, to the injury of full and free competition, or any other arrangements, contracts, or agreements, by and between its agents and subagents, which tend to lessen full and free competition in the sale of all such articles manufactured and imported into the state, and which amount to a subterfuge for the purpose of obtaining the same advantage and purposes are declared to be against public policy, unlawful, and void.