It is hereby declared that marketing of motor fuel in Alabama is affected with the public interest. It is hereby declared to be the legislative intent to encourage fair and honest competition, and to safeguard the public against creation of monopolies or unfair methods of competition, in transactions involving the sale of, or offer to sell, or inducement to sell motor fuel in the wholesale and retail trades in this state. It is further declared that the advertising, offering for sale, or sale of motor fuel below cost or at a cost lower than charged other persons on the same marketing level with the intent of injuring competitors or destroying or substantially lessening competition is an unfair and deceptive trade practice. The policy of the state is to promote the general welfare through the prohibition of such sales. The purpose of the Motor Fuel Marketing Act is to carry out that policy in the public interest, providing for exceptions under stated circumstances, providing for enforcement and providing penalties.