Or maybe &quot;productivity growth&quot; will have to stop at some point; even at 1% year over year, that makes 1000x growth in 700 years.<p>Barring space travel, it&#x27;s hard to even imagine 1000x growth over the next 700 years in any real sense (as opposed to just adding zeros to currency), and completely absurd to imagine 1 million times growth over the next 1400 years.