"The best model is maybe Walras' meaning of social abundance, i.e., monetary goods.[3] 'By friendly riches', says Walras, 'I mean all things, material or irrelevant (it doesn't make any difference which in this specific circumstance), that are scant, in other words, from one perspective, helpful to us and, then again, simply accessible to us in restricted quantity'."[4] - Montani G. (1987) English financial expert Lionel Robbins is popular for his meaning of financial aspects which utilizes shortage