1. The agreed time limit of the fixed investment fund for postal savings is to sign a contract to realize that investors agree to purchase the fund for a certain period of time. The specified definite time is the agreed date mentioned here, and the time period between each adjacent agreed date is called the agreed period.

2. Automatic Investment Plan (AIP) is called lazy financial management, and its value stems from a saying circulating on Wall Street: "It is more difficult to step on the market accurately than to catch a flying knife in the air." If you adopt the method of buying in batches, you will overcome the defects of buying and selling at one time, balance the cost and make yourself invincible in investment, that is, the fixed investment method.