Angus Maddison's estimates of historical GDP are outdated now. I'd look at works like Broadberry's China, Europe and the Great Divergence: A Study in Historical

Angus Maddison's estimates of historical GDP are outdated now. I'd look at works like Broadberry's China, Europe and the Great Divergence: A Study in Historical National Accounting, 980-1850 [1]. [1]https://www.economics.ox.ac.uk/oxford-economic-and-social-history-working-papers/china-europe-and-the-great-divergence-a-study-in-historical-national-accounting-980-1850 https://www.economics.ox.ac.uk/oxford-economic-and-social-hi...