The phrase was not popular among economists before the twentieth century; Alfred Marshall never used it in his Principles of Economics textbook and neither does William Stanley Jevons in his Theory of Political Economy.
Vor dem 20. Jahrhundert war der Begriff nicht weit verbreitet; Alfred Marshall benutzte den Begriff in seinem Lehrbuch Principles of Economicsc an keiner einzigen Stelle, ebenso wenig William Stanley Jevons in seiner Theory of Political Economy.