By Pauline Yong, author of “I Love Stocks” Studies by economists and psychologists have found that investors are most influenced by recent events – market news, political events, earnings reports – and ignore long term investment and economic fundamentals. Furthermore, with traders using computers to buy and sell stocks and receive information, news affecting investor psychology travel faster than ever before. As a result, if a movement starts in one direction, it tends to pick up more and more investors with time and momentum. It’s like a domino effect! Successful investors usually do a lot of research and they have an investment plan before they invest. Although a good research does not guarantee the performance of any particular investment, but it does help to avoid more of the bad ones. Successful investors even develop contingency plans for what to do when a special investment or situation comes along that requires a little quicker action. The goal is to not let your emotions or too much information rule your investment plan. The study of market psychology can help investors to identify the common mental mistakes that repeatedly made by them. Common mistakes sometimes lead people to incorrectly process new information about a company and in turn, misjudge a stock’s true value. In general, the stock market preys on fear and greed, and it’s not designed to reward the masses. In other words, the stock market acts on fear, speculation – and herd mentality. Now, let’s go through some of the emotions and mental errors that cause stock prices to move wildly. Herd Mentality Herd mentality refers to an irrational collective buying and selling for no strong reason. It could be a surprise rally which is uncalled for or a panic sell-off that defies the logic. For example, if a company is expected to pay a big dividend, its stock price will rise - but if that company then pays a less-than-expected (but substantial) dividend, the price will fall. The company is still profitable, but it's not living up to expectations, hence it faces the selling pressure. Once the selling pressure is initiated by a group of investors, other players in the market will follow suit. The rationale behind this is: we tend to feel comfortable doing things together. One can even see this trait in other animals such as a flock of birds or a school of fish. They seem to follow a leader. The way to profit from this phenomenon is to resist the herd mentality and try to be a leader. In any crowd, or group behaviour situation, the ones that lead are the ones that draw all the benefits, while the ones that follow blindly are the ones that take all the risks.