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The mean difference between literacy in PDM and Vanilla is there's little points in making clergy over 2% of your population, as 2% is optimal for both literacy gain and research gain. (you need 4% clergy to max literacy gain in vanilla.)

Techs that improves education efficiency are:

Commerce-Market Structure (+10% per level), Culture-Social Thought (each more effective than last), and Mass Media invention at end of Culture-Psychology (+50%).