The second sentence makes an error. "Advertising remains useful to firms only as a tool for persuading consumers to purchase advertised products." is not true a

The second sentence makes an error. "Advertising remains useful to firms only as a tool for persuading consumers to purchase advertised products." is not true at all. Only ~10% of advertising dollars are spent on Direct Response advertising. ~90% of the ~$500B/year spent globally on advertising is Brand advertising.