问答题 Let's take an example. Suppose that a share of Haier in the Hong Kong Stock Market had a closing price yesterday of HK $ 10, but new information was announced after the market closed that caused a revision in the forecast of price next year to go to HK $15. If the annual equilibrium return on Haier is 20%, what does efficient markets theory indicate the price will go to today when the market opens? (Assume that Haier pays no dividends.)