“The Collapse of the Soviet Union and the Productivity of American Mathematicians” comes to mind as an interesting recent natural experiment where the floodgate of Russian mathematical talent was unleashed after the collapse of the USSR and many of them successfully rose in America despite academic math being a zero-sum game; consistent with meritocracy.
Was extremely democratic. Do we know this is still true?
“The Collapse of the Soviet Union and the Productivity of American Mathematicians” comes to mind as an interesting recent natural experiment where the floodgate of Russian mathematical talent was unleashed after the collapse of the USSR and many of them successfully rose in America despite academic math being a zero-sum game; consistent with meritocracy.
At the outlier level, I think so—see e.g. Perelman. At the normal professor-of-mathematics level, probably not.