"Marginal effect refers to a certain period of time, when a person continues to consume an item, with the increase of the consumption quantity of the item, its total utility increases correspondingly, but the utility it brings has a decreasing trend.

In fund investment, marginal utility also exists! Every time a fixed investment is deducted, it will have an impact on the entire fixed investment cost. However, with the extension of fixed investment time and the increase of fixed investment times, the impact of single deduction on the overall cost is getting smaller and smaller, resulting in diminishing marginal effect.

Therefore, when making a fixed investment, we should also consider "taking it as soon as possible", and it is very important to set our own profit targets. "