Paul Krugman

@paulkrugman ↗

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Last Checked Aug. 12, 2019

Created

Sat Aug 25 18:26:44 +0000 2018

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Paul Krugman @paulkrugman

This brought a lot of heavy clay soil under cultivation: regions that were sparsely populated by barbarians under R… https://t.co/ZwbeIrO145 — PolitiTweet.org

Posted Aug. 25, 2018 Hibernated

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Paul Krugman @paulkrugman

So, two technological hypotheses. First, the heavy plow, introduced in the early Dark Ages. 5/ https://t.co/ml1xvoKHnz — PolitiTweet.org

Posted Aug. 25, 2018 Hibernated

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Paul Krugman @paulkrugman

Second, the stirrup. Made cavalry much more effective. Since horses are harder to put on ships than infantry, did t… https://t.co/EesTDnV8SG — PolitiTweet.org

Posted Aug. 25, 2018 Hibernated