(31)Modern labelling facilitates a competitive market environment in which dynamic, efficient, innovative operators can make full use of labelling to sell their products. Having regard to both the business-to-business relationship in the marketing of livestock feed and the relationship between the producer and the purchaser of pet food, Codes of good labelling for these two areas could be a useful means of achieving the objectives of modern labelling. The Codes should lay down provisions that would enable the purchaser to make informed choices. They should also give the person responsible for the labelling important guidance on different elements of the labelling. They may assist in the interpretation of the framework for voluntary labelling or the presentation of mandatory labelling. The Codes should be used on a voluntary basis, except in cases where use of the Codes is indicated on the labelling.