In the UK a least it may be the pernicious influence of PPE on the political system. PPE was introduced in the 1920s as ‘Modern Greats’ and was geared towards civil service candidates. As the name suggests it was intended to replace Greats. I think, however, despite what Oxford PPEists claim it has resulted in and responded to a narrowing of intellectual interests on the part of all politicians. Broader intellectual interests might have been a better phrase.
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