In the public interest and in order to promote the orderly sale and distribution of alcoholic liquor, to foster temperance and to promote the public welfare, the legislature finds: (a) That sales prices of alcoholic liquor sold by manufacturers and others to distributors licensed in this state should be no higher than the lowest price for which the same is sold to distributors anywhere in the continental United States; and (b) that minimum mark-ups on alcoholic liquor sold by retailers licensed in this state should be determined and regulated by law.