"Advertising Costs." . . "Kosten-Nutzen-Analyse." . . "Publicité." . . "Werbung." . . . . . . "How to make your advertising twice as effective at half the cost" . "How to make your advertising twice as effective at half the cost"@en . "How to make advertising twice as effective at half the cost"@en . . . . . . . . . . . . . . . . . . . . "Advertising." . .