I'm not sure if you have to verify as some sort of investing class to access but GMO (Grantham's fund) has a lot of papers published. This: https://www.gmo.com

I'm not sure if you have to verify as some sort of investing class to access but GMO (Grantham's fund) has a lot of papers published. This: https://www.gmo.com/docs/default-source/research-and-commentary/strategies/asset-allocation/the-race-of-our-lives-revisited.pdf?sfvrsn=4 https://www.gmo.com/docs/default-source/research-and-comment... has that quoted figure and references this: 2 D.R. Montgomery, Dirt: The Erosion of Civilizations, University of California Press, 2007.