For a modern society, an inadequate amount of money in circulation will cause liquidity problems for business activities and generally depress the economy; too much money will also wreak havoc in the form of inflation.
對現代社會而言，社會上流通的錢太少，會導致工商活動周轉困難，百業不興；錢太多，又會泛濫成災，造成通貨膨脹。