Why are we in the Netherlands today so much richer than our grand and great-grand parents, living only 50, 100, 200 years ago? Or why are some countries richer than other? Questions like these lie at the heart of Economic History.The basis for answering these questions is consistent data on long run global development, which we collect within the Maddison Project. Our research shows that over the past 200 year, the average global income per person has increased nearly 12 times (Bolt & Van Zanden, 2020; OECD, 2021).Further, economic growth accelerated over time. During the 19th century, the average global income doubled to roughly 2200 dollars; during the twentieth century the global average income quadrupled to over 12,000 dollars. Whil...