The impact of Economics on world history from around 500CE to 1000CE By hanhaj 202 Water mills Oct 6, 605 The grand canal Oct 6, 610 Irrigation systems Oct 6, 1347 The Black Death Oct 6, 1425 printing Mar 2, 2022 Paper money Mar 2, 2022 Gunpowder Mar 2, 2022 Iron plow Mar 2, 2022 Fast-Ripening rice Mar 2, 2022 monsoon winds