In democracies, the driver of change is typically elections; in autocracies, it is typically biology. It is often said that autocratic leaders are therefore less likely to be educated. Leaders’ education level has been found to be a positive predictor of, among other things, economic growth. Here’s a look at the tenure of around 700 leaders sorted by political longevity in the world’s autocratic and anocratic countries, along with a selection from present-day democracies, since 1950 or thereabouts.

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