This paper addresses the relationship between the development of the concepts of autarky and «economy of the extended space» in the German-speaking world and the framing of economic relations between Germany and Brazil in the 1930s. According to this «autarkic» way of conceiving economics, in order to thrive, an economy has to be autonomous regarding its supply of necessary inputs. Proposals presented in the Annual Reports transmitted to the German Foreign Office by German diplomatic representatives in Brazil encouraged, for example, the negotiation of bilateral trade agreements and the expansion of the Brazilian production of strategic inputs for Germany. The choice of Karl Ritter, an expert in economic matters, as ambassador to Brazil is also representative of this strategy.