<prompt> Translate the following text to EnglishKatika miaka ya 1960, shule ya revisionist ya wanahistoria wa uchumi ilithibitisha kwamba kupunguza mauzo ya nje ya ngano ingekuwa na dondoo dogo tu katika msiba.  <response>: In the 1960s, a revisionist school of economic historians proved that limiting wheat exports would have made only a puny dent in the calamity. 