...consumers do not buy one brand of soap, or coffee, or detergent. They have a repertory of four or five brands, and move from one to another. They almost never buy a brand which has not been admitted to their repertory during its first year on the market.
David OgilvyRemove advertising, disable a person or firm from proclaiming its wares and their merits, and the whole of society and of the economy is transformed. The enemies of advertising are the enemies of freedom.
David Ogilvy