20. Efficient Market Hypothesis The Durkin Investing Agency has been the best stock picker in the country for the past two years. Before this rise to fame occurred, the Durkin newsletter had 200 subscribers. Those subscribers beat the market consistently, earning substantially higher returns after adjustment for risk and transaction costs. Subscriptions have skyrocketed to 10,000. Now, when the Durkin Investing Agency recommends a stock, the price instantly rises several points. The subscribers currently earn only a normal return when they buy recommended stock because the price rises before anybody can act on the information. Briefly explain this phenomenon. Is Durkin’s ability to pick stocks consistent with market efficiency?21. Efficient Market Hypothesis Your broker commented that well-managed firms are better investments than poorly managed firms. As evidence your broker cited a recent study examining 100 small manufacturing firms that eight years earlier had been listed in an industry magazine as the best-managed small manufacturers in the country. In the ensuing eight years, the 100 firms listed have not earned more than the normal market return. Your broker continued to say that if the firms were well managed, they should haven produced better-than-average returns. If the market is efficient, do you agree with your broker?22. Efficient Market Hypothesis A famous economist just announced in The Wall Street Journal his findings that the recession is over and the economy is again entering an expansion. Assume market efficiency. Can you profit from investing in the stock market after you read this announcement?23. Efficient Market Hypothesis Suppose the market is semistrong form efficient. Can you expect to earn excess returns if you make trades based on:a. Your broker’s information about record earnings for a stock?b. Rumors about a merger of a firm?c. Yesterday’s announcement of a successful new product test?24. Efficient Market Hypothesis Imagine that a particular macroeconomic variable that influences your firm’s net earnings is positively serially correlated. Assume market efficiency. Would you expect price changes in your stock to be serially correlated? Why or why not?25. Efficient Market Hypothesis The efficient market hypothesis implies that all mutual funds should obtain the same expected risk-adjusted returns. Therefore, we can simply pick mutual funds at random. Is this statement true or false? Explain.26. Efficient Market Hypothesis Assume that markets are efficient. During a trading day American Golf Inc. announces that it has lost a contract for a large golfing project that, prior to the news, it was widely believed to have secured. If the market is efficient, how should the stock price react to this information if no additional information is released?27. hiệu quả thị trường Hypothesis người thăm dò, Inc, là một công khai được giao dịch vàng khảo sát các công ty ở Alaska. Mặc dù các công ty tìm kiếm đối với vàng thông thường không thành công, những người thăm dò thỉnh thoảng thấy một tĩnh mạch phong phú của quặng. Mô hình những gì bạn mong đợi để quan sát cho người thăm dò trở về tích lũy bất thường nếu thị trường là hiệu quả?28. bằng chứng về thị trường hiệu quả một số người cho rằng giả thuyết thị trường hiệu quả không thể giải thích thị trường sụp đổ năm 1987 hoặc tỷ lệ thu nhập giá cao cổ phiếu Internet trong thời gian cuối thập niên 1990. Giả thuyết khác hiện đang được sử dụng cho những hiện tượng hai?
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