A fundamental problem with huge cities is that smart, talented people go there and never have children who would inherit they smarts. For this reason they are a human resource drain on everywhere else. In short, &quot;cities are IQ shredders&quot; (per <a href="http:&#x2F;&#x2F;www.xenosystems.net&#x2F;iq-shredders&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.xenosystems.net&#x2F;iq-shredders&#x2F;</a>).