A good proxy measure for the accuracy of BBdM's prediction would be how rich he got out of them. Given that BBdM's mostly concerned with macroscopic predictions

A good proxy measure for the accuracy of BBdM's prediction would be how rich he got out of them. Given that BBdM's mostly concerned with macroscopic predictions about politics his claim [1] that he was right in 2/3 of his predictions, should have translated into immense wealth. [1] Source: an old interview with him, maybe 10 years ago. I might be wildly misremembering here. Sorry, no better sources.