Chapter 7: Q.5 (page 209)
Suppose that you are asked to forecast future stock prices of ABC Corporation, so you proceed to collect all available information. The day you announce your forecast, competitors of ABC Corporation announce a brand new plan to merge and reshape the structure of the industry. Would your forecast still be considered optimal?
Short Answer
No, because the company's price would be affected by rivals, the forecasted future stock price would have to alter.