You&#x27;ve got to hand it to someone who uses our lack of flying cars as proof that innovation has slowed.<p>Then there&#x27;s this later on: &quot;you or I could walk into a 1940s apartment ... and we’d find it basically functional. We’d be annoyed at the lack of television and Internet — but not horrified or disgusted.&quot;<p>But obviously these intense, abrupt changes of hygiene aren&#x27;t going to be indefinitely repeated; there&#x27;s only so much filth to remove. And it&#x27;s not as if there haven&#x27;t been dramatic shifts in standards of hygiene since then, although they&#x27;re a bit subtler--look at the chart here on frequency of showering, for instance: <a href="http:&#x2F;&#x2F;www.businessinsider.com&#x2F;charts-that-will-restore-your-faith-in-humanity-2013-5" rel="nofollow">http:&#x2F;&#x2F;www.businessinsider.com&#x2F;charts-that-will-restore-your...</a><p>Of course no one can be certain what the US&#x27;s economic future will look like, but it seems absurd to argue that all the big changes are over and things will mostly stay the same from now on.