| <li><div class="li">Between 4,000 BC and 3,000 BC, GWP doubled in 1,000 years, yet it had never before doubled in as few as 4000 years</div></li> | <li><div class="li">Between 4,000 BC and 3,000 BC, GWP doubled in 1,000 years, yet it had never before doubled in as few as 4000 years</div></li> |
| <li><div class="li">Between 10,000 BC and 4,000 BC, GWP doubled in 6,000 years, yet there is no record of it doubling earlier in as few as 24,000 years. The records at that point are fairly sparse, so this is less clear, but it seems unlikely that there was a doubling in 24,000 years.<span class="easy-footnote-margin-adjust" id="easy-footnote-5-2406"></span><span class="easy-footnote"><a href="#easy-footnote-bottom-5-2406" title="Toward the end of the period it took 15,000 years to grow by $0.6Bn, and growth of $1.8Bn would have been needed for a doubling. So assuming linear growth at the end-of-period rate, this would have taken around 45,000 years, whereas in if growth was speeding up, it should have taken longer."><sup>5</sup></a></span> This appears to coincide with the beginning of agriculture, in around 9000BC.<span class="easy-footnote-margin-adjust" id="easy-footnote-6-2406"></span><span class="easy-footnote"><a href="#easy-footnote-bottom-6-2406" title=' Khan Academy. “The Dawn of Agriculture (Article).” Accessed April 14, 2020. <a href="https://www.khanacademy.org/humanities/world-history/world-history-beginnings/birth-agriculture-neolithic-revolution/a/where-did-agriculture-come-from">https://www.khanacademy.org/humanities/world-history/world-history-beginnings/birth-agriculture-neolithic-revolution/a/where-did-agriculture-come-from</a>. '><sup>6</sup></a></span></div></li> | <li><div class="li">Between 10,000 BC and 4,000 BC, GWP doubled in 6,000 years, yet there is no record of it doubling earlier in as few as 24,000 years. The records at that point are fairly sparse, so this is less clear, but it seems unlikely that there was a doubling in 24,000 years.<span class="easy-footnote-margin-adjust" id="easy-footnote-5-2406"></span><span class="easy-footnote"><a href="#easy-footnote-bottom-5-2406" title="Toward the end of the period it took 15,000 years to grow by \$0.6Bn, and growth of \$1.8Bn would have been needed for a doubling. So assuming linear growth at the end-of-period rate, this would have taken around 45,000 years, whereas in if growth was speeding up, it should have taken longer."><sup>5</sup></a></span> This appears to coincide with the beginning of agriculture, in around 9000BC.<span class="easy-footnote-margin-adjust" id="easy-footnote-6-2406"></span><span class="easy-footnote"><a href="#easy-footnote-bottom-6-2406" title=' Khan Academy. “The Dawn of Agriculture (Article).” Accessed April 14, 2020. <a href="https://www.khanacademy.org/humanities/world-history/world-history-beginnings/birth-agriculture-neolithic-revolution/a/where-did-agriculture-come-from">https://www.khanacademy.org/humanities/world-history/world-history-beginnings/birth-agriculture-neolithic-revolution/a/where-did-agriculture-come-from</a>. '><sup>6</sup></a></span></div></li> |
| <span class="easy-footnote-margin-adjust" id="easy-footnote-bottom-5-2406"></span>Toward the end of the period it took 15,000 years to grow by $0.6Bn, and growth of $1.8Bn would have been needed for a doubling. So assuming linear growth at the end-of-period rate, this would have taken around 45,000 years, whereas in if growth was speeding up, it should have taken longer.<a class="easy-footnote-to-top" href="#easy-footnote-5-2406"></a> | <span class="easy-footnote-margin-adjust" id="easy-footnote-bottom-5-2406"></span>Toward the end of the period it took 15,000 years to grow by \$0.6Bn, and growth of \$1.8Bn would have been needed for a doubling. So assuming linear growth at the end-of-period rate, this would have taken around 45,000 years, whereas in if growth was speeding up, it should have taken longer.<a class="easy-footnote-to-top" href="#easy-footnote-5-2406"></a> |
