The measurement problem, if by quantitative you mean "relating to, measuring, or measured by the quantity of something".
There is no consistent mathematical standard of measurement by which money is created. Instead, the monetary value of some good or service used as capital for a loan is largely up to the arbitrary appraisal of the bank.
There is no consistent mathematical standard of measurement by which money is created. Instead, the monetary value of some good or service used as capital for a loan is largely up to the arbitrary appraisal of the bank.