"Unión monetaria." . . "Wirtschaftstheorie." . . "[Penningenhetens problem.] The Problem of the Monetary Unit" . "[Penningenhetens problem.] The Problem of the Monetary Unit"@en . . . . . . . . . . . . . . . . . "The problem of the monetary unit" . "The problem of the monetary unit"@en . "The problem of the monetary unit"@sv . "The Problem of the monetary unit" . . . . . . . . . . . . . . . . . . . . . "Währungseinheit." . . . . "Rechtstheorie." . . "Dinero." . . "Moneda Internacional." . . "Sistema monetario europeo." . . "Cuestión monetaria." . . "Monnaie." . . "Moneta." . .