Finance theory believes that investors decisions are based on profit maximisation. Efficient Markets Hypothesis (EMH), also considered as the heart of traditional finance implies that investors get all of the information without cost. As such, the price of stocks always reveals their fundamental value and is consistent; nonetheless, the reality depicts that investors in the markets are not always rational in their decisions and that other factors might affect them when they are making their investment decisions. Most economic theories are based on the notion that individuals behave rationally and that every existing information is set in the investment process. An efficient market hypothesis is the crux of the assumption.
