Abstract Professor Yasuhiro Sakai (see 2016; 2018) has argued that there is an mysterious problem in the A Treatise on Probability, 1921 in chapter 3 on page 39 (page 42 of the 1973 CWJMK edition). He argues that there is an unsolved mystery that involves this diagram that has remained unexplained in the literature. The mystery is that Keynes does not explain what he is doing in the analysis involving the diagram starting on the lower half of page 38 and ending on page 40 of chapter III....
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