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FYI: Harry Markowitz, whose name every financial planner knows, published two papers, one in 1952 and the other in 1991. The latter sought to correct misunderstandings that arose from the former. Together they provide a valuable, yet incomplete, architecture for guiding individual investment decisions. Regards, Ted https://www.advisorperspectives.com/articles/2019/05/28/the-markowitz-conundrum