The "72 rule" in financial management means that it takes time to double the principal and not get the interest back. The calculation formula is: the time required to double the principal =72/ year rate of return.

Extended data:

Other laws of financial management:

"80" law: the reasonable proportion of stocks in total assets is equal to 80 MINUS age plus a percentage sign. For example, at the age of 30, stocks can account for 50% of the total assets, which means that at the age of 30, 50% of the assets can be invested in stocks, which is an acceptable age risk, while at the age of 50, 30% is appropriate.

References:

Baidu encyclopedia-financial management rules