Zero investment can generally represent the investment behavior of small investors, that is, retail investors, from which the trend of the investing public can be inferred. Due to the lack of information, experience, emotional influence and independent judgment, the investing public has the operational characteristics of "following the trend", often buying at a relatively high level and selling at a relatively low level, and its holders are called zero-share investors.

Zero investment is relative to the whole share transaction, and the whole share is generally 100 shares; Less than 100 shares are called zero shares. Because the commission of Easy Investment is higher than the whole share transaction, professional investors or institutional investors always try to avoid buying small shares. Most of the zero investors are amateur investors with limited funds. Amateur investors' buying behavior is generally considered incorrect, so if they do the opposite of their buying behavior, they may make a profit. There are two important indicators in the analysis of zero share trading: one is the net trading volume of zero share (zero share buying volume-zero share selling volume); The other is the zero share trading ratio (zero share buying and zero share selling).