CHAPTER ONEINTRODUCTION1.1 BACKGROUND TO THE PROBLEMThe availability of information is crucial to the successful pursuance of virtually every human endeavor. However, Hirshleijer and Riley (1979) observed that in order for any particular piece of information to be beneficial to the user, it must have precise definition and value. While the definition relates to the message about the various events that may happen, the value is about the payoffs likely to be derived by acting on the message received. If a message is not understood by the people for whom it is meant, no action may be taken. If an action is taken at all, it may be a wrong one. Even when the message is understood by the people concerned, their reaction may differ from one another depending on the values perceived to be derived from acting on the message. The values derivable from the message may also be different among people depending on the message as well as the perceived net benefits or utility resulting from taking actions. Several actions may be taken after receiving an information. Some of the actions may be Optimal, while others may be sub-optimal. The optimal action was defined by Copeland & Weston (1983)2 as the product of the conditional probability of an event taken place given the receipt a message and the utility resulting from taking an action, given that a particular event has occurred. There is also the marginal probability of receiving a message, the optimal action taken on receiving the message and the expected utility to be derived, given the arrival of the message. Problems arise when economic agents fail to act on relevant information. Such in action may be due to lack of understanding of the message being put across or due to lack of resources to benefit from the information. For example, firms may release their dividend figures to the Capital market if the information contained in released dividend is not understood by the market participants and investors, appropriate portfolio adjustments may not be made through trading of shares. If on the other hand, investors react appropriately to dividend announcements by adjusting their portfolios, which in turn manifests in share price changes, firms may not understand why the market determined their firms’ share prices the way it has done, if they also do not understand the message being put across by investors. It is therefore important for both the firms and investors to understand information available in the capital market. The understanding of the available information will go a long way to enhance the quality of decision made by firms and investors.