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Verstärkt der Handel mit Agrar-Derivaten die Preisschwankungen von Agrar-Produkten? In der politischen Diskussion wird diese These oft als Grund für eine strenge Reglementierung des Handels mit Agrar-Derivaten angeführt. Hier diskutiere ich die Voraussetzungen, auf denen verschiedene Argumente für diese These beruhen. Eine zentrale Rolle dabei spielen die Begriffe von Gleichgewicht und Selbstreferenz. Diese Begriffe spielen in der Logik und der Physik eine wichtige Rolle, haben aber in der Ökonomie erstaunliche Konsequenzen.