Karl August Fritz Schiller (24 April 1911 – 26 December 1994) was a German economist and politician of the Social Democratic Party (SPD). From 1966 to 1972, he was Federal Minister of Economic Affairs and from 1971 to 1972 Federal Minister of Finance. He was the inventor of the magic square, depicting Economic equilibrium, and of the Concerted activity (Konzertierte Aktion) to reflate the German market. He is thus seen as one of the most influential German economists beside Ludwig Erhard.
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