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<jats:p> A theory explaining how the attributes of cities scale with city size may help to inform urban planning. <jats:named-content content-type="related-content"> [Also see Report by <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6139" page="1438" related-article-type="in-this-issue" vol="340" xlink:href="10.1126/science.1235823">Bettencourt</jats:related-article> ] </jats:named-content> </jats:p>
