Thus enabling investors to achieve the goal of accumulating small amounts into a large sum. A single investment can achieve the maximum appreciation effect in an upward trend, but during times of severe market fluctuations, the method of a single lump-sum investment inevitably carries excessive market risk. Many investors also face difficult choices when it comes to selecting an investment method. Tests indicate that there is no absolute distinction between good and bad investment methods; for individuals, it's only a matter of suitability...