假定金融体制经历了一场巨大变化。人们能够从其储蓄账户中开出支票。货币需求会发生什么变化？货币总量是否需要重新定义？ Assume that the financial system undergoes substantial changes and that people become able to draw checks on their saring deposits． What would happen to money demand？Would there be a case for redefining the monetary aggregates？