&gt; Generally &quot;Physical growth&quot; and &quot;GDP growth&quot; are not really similar.<p>No, two different things. But just the same, neither can grow infinitely.<p>&gt; A number can grow infinitely.<p>Especially if it&#x27;s a measure of a scale that&#x27;s constantly adjusting itself.<p>Your explanation of economic growth sounds like how American capitalists justify the existence of growth economies. Economic growth cannot be infinite, just like physical growth. Economic growth depends on resources <i>just like any other kind of growth</i>. When the resources run out, the everything stops. You can&#x27;t math your way out of that.<p>The only way to sustain our current economic burn at our current (and growing) population is to move off-planet.