请问LEVEL ONE book 2 里面的three  primary types of depository institutions,

commercial banks, the terms thrifts and thrift institutions , 和a money market mutual fund这三个有什么不同？

我怎么看commercial bank 和thrift institutions 的定义是一样的？

谢谢老师！

thrift institutions 的意思如下：

The general term for savings banks, savings and loan associations, and credit unions.

而money market mutual fund指的是货币市场基金，可以随时提款，因此也具有储蓄的功能