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In this comment to Hans-Hermann Hoppe’s essay, the authoress summarises the results achieved by the theories of international commerce and the mobility of production factors, referring in particular to the Heckscher-Ohlin model. She also sums up the outcomes of studies which have subjected this model to empirical checks. She concludes that for countries subject to immigration the zero-immigrant option is in actual fact highly unfeasible. The open doors option, on the other hand, receives low consensus. The only possible and feasible option is thus a combination of selective immigration policies and tight controls backed by aid policies, commercial openings and, last but not least, a decentralisation of production.