Money Market Fund ( MMF) is one of the main categories mutual funds, it paid market-based rates by investing the small sums gathered from many customers in short-term market instruments-primarily commercial paper and Treasury securities and in large certificates of deposit. 货币市场基金是共同基金的一种,它汇集了众多的小额投资,集中投资于短期货币市场工具如商业票据、短期国库券和大额可转让存单等。