There is a case in the book Millionaire Teacher. A pair of friends, Starr and Lucy, have no money, so they start to give their parents $65,438 +0.45 a day for investment. As an adult, she still invests $45 a month. On the other hand, Lucy also has a good job and lives a "high quality" life. Since the age of 40, she has invested 800 dollars a month. She laughed at Starr's investment of only $45 a month, fearing that Starr would not have enough money after retirement, and kept urging her to save more. But in the end, under the same return on investment, when they were 65 years old, Lucy's final harvest was $237052 less than Starr's. The reason is that Starr can invest with $32,400, and then turn the money into more than $6,543,800. However, although Lucy's monthly investment is eight times that of Starr, because she started late, Lucy finally failed to get more returns.