RT @IronEconomist: The evidence base for this claim is very weak. The evidence i

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RT @IronEconomist: The evidence base for this claim is very weak. The evidence is that virtually all relative attainment effects fade out p…

Source date (UTC): 2020-06-09 15:37:39 UTC

Original post: https://twitter.com/i/web/status/1270379538791497732

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