The strong growth of the narrow money reflected in part a low opportunity cost of holding non - interest bearing monetary assets as well as an increase in cash demand associated with a rising number of tourists from the mainland 港元狭义货币增长强劲，部分原因是持有无息货币资产的机会成本偏低，以及内地来港旅客数目日增，令现金需求上升。
We study the bank ' s vault cash optimal management problem in this paper . following the existing research , our contribution is on : 1 . continuing the research of the reference [ 12 ] , we give the numerical methods of calculating the cash demand and the net payout , furthermore we give the method of data mining in the practical calculating 本文研究了银行现金备付金优化管理问题，在前人研究的基础上，本文的贡献主要在于： 1 、继续了文献12的研究，提出了计算现金净支付函数、现金需求函数等的数值计算方法，以及模型参数估计中的数据挖掘方法。
