A share is a low-risk share, which is called stable share or class A score. This kind of share is similar to fixed income products, and it obtains fixed income at the agreed interest rate, and it is obtained before the high-risk share, with less risk. A share fund holders are equivalent to creditors, which is equivalent to lending funds to aggressive share holders to obtain fixed income.
Share B is a high-risk share, which is called aggressive share or class B share, and the name of the fund is called ×× Grade B. This kind of share gets the residual income after being paid to the stable share. B-share fund holders are equivalent to shareholders of the company, which is equivalent to obtaining financial leverage by financing stable share holders.