You aren't advertising to a standing army; you are advertising to a moving parade. Three million consumers get married every year. The advertisement which sold a refrigerator to those who got married last year will probably be just as successful with those who'll get married next year. An advertisement is just like a radar sweep, constantly hunting new prospects as they come into the market. Get a good radar and keep it sweeping.
David OgilvyIt takes uncommon guts to stick to one style in the face of all the pressures to 'come up with something new' every six months. It is tragically easy to be stampeded into change. But golden rewards await the advertiser who has the brains to create a coherent image, and the stability to stick with it over a long period.
David Ogilvy