&gt;America is spent out. The US personal savings rate is under 5%. Everything else gets spent, and the saved money gets spent later. There&#x27;s no &quot;pent-up demand&quot; waiting to be unlocked by advertising.<p>Though potentially you could persuade people to work harder.<p>Take me, for instance. I could theoretically retire, if I were happy to live, Mr Money Mustache style, on a very modest income. But every time I pass one of those Jaguar billboards I am reminded to keep working so I can retire later with shinier objects.