The GVH also supervises the compliance with the provisions on the prohibition of misleading advertising and on the lawful use of comparative advertising laid down in the Act on Business Advertising Activity. The reason for this is that the said rules are in close connection with the prohibition of unfair manipulation of consumer choice, which is declared by the Competition Act. Deception of consumers is namely usually based on misleading information, which is mostly given by advertising; however, all kinds of information supply carried out prior to the purchase or use of goods or services count here.