Name: Kam Lai Yee
Tutor: Howard Chow
Efficient market is one in which stock prices fully reflect the information of a company, either positive or negative. If the information from a company is positive, investor will give a good response and the price of shares of this company will increase. Since the information is reflected in price at once, normal rate of return should only be obtained. Also the price that the firm received from issuing securities is the present value, and valuable financing opportunities are unavailable. There are three conditions that will cause market efficiency, which are the rationality of investors, dependent deviations from rationality and arbitrage. Three forms are divided by researcher according to the availability of information. The first one is Weak Form. The price in this form were just focused the past stock price. This is the cheapest, easiest strategy to find the pattern in stock price. But the future information is random due to random walk hypothesis therefore it is unable to generate any profit. The Semistrong Form will appear when all information is publicly available, including the historical price information. The price should rise at once when the news release and no chance for profit when the investor analysis the information. The Strong Form appears in which the price reflects all information publicly or privately on market. Secret news or insider’s news is useless for investors to earn profit in this form. Arbitrage will generates profit from the rationally purchase and sale of similar stocks in market in order to make the profit riskless. The rationally decision is included estimate the business rationally and methodically. So in Weak Form just need to obtain the historical stock information is enough for knowing the different of price. But financial statement, economic and politic situation is needed to consider in order to obtain the arbitrage...