Economists have long recognized that advertising has two main functions: to inform and to persuade. In the information age, the information function is obsolete, because consumers can get all the product information they want from a quick Google search. That makes virtually all advertising today...

The vast amount of product information available to consumers through online search renders most advertising obsolete as a tool for conveying product information. Advertising remains useful to firms only as a tool for persuading consumers to purchase advertised products. In the mid-twentieth...