Demand and Supply ? This fundamental rule of economics holds good for the equity market as well. The price is directly affected by the trend of stock market trading. When more people are buying a certain stock, the price of that stock increases and when more people are selling he stock, the price of that particular stock falls. Now it is difficult to predict the trend of the market but your stock broker can give you fair idea of the ongoing trend of the market but be careful before you blindly follow the advice.

News ? News is undoubtedly a huge factor when it comes to stock price. Positive news about a company can increase buying interest in the market while a negative press release can ruin the prospect of a stock. Having said that, you must always remember that often times, despite amazingly good news, a stock can show least movement. It is the overall performance of the company that matters more than news. It is always wise to take a wait and watch policy in a volatile market or when there is mixed reaction about a particular stock.

Market Cap ? If you are trying to guess the worth of a company from the price of the stock, you are making a huge mistake. It is the market capitalization of the company, rather than the stock, that is more important when it comes to determining the worth of the company. You need to multiply the stock price with the total number of outstanding stocks in the market to get the market cap of a company and that is the worth of the company.

Earning Per Share ? Earning per share is the profit that the company made per share on the last quarter. It is mandatory for every public company to publish the quarterly report that states the earning per share of the company. This is perhaps the most important factor for deciding the health of any company and they influence the buying tendency in the market resulting in the increase in the price of that particular stock. So, if you want to make a profitable investment, you need to keep watch on the quarterly reports that the companies and scrutinize the possibilities before buying stocks of particular stock.

Price/Earning Ratio - Price/Earning ratio or the P/E ratio gives you fair idea of how a company's share price compares to its earnings. If the price of the share is too much lower than the earning of the company, the stock is undervalued and it has the potential to rise in the near future. On the other hand, if the price is way too much higher than the actual earning of the company and then the stock is said to overvalued and the price can fall at any point.

Before we conclude this discussion on share prices, let me remind you that there are so many other reasons behind the fall or rise of the share price. Especially there are stock specific factors that also play its part in the price of the stock. So, it is always important that you do your research well and stock trading on the basis of your research and information that you get from your broker. To get benefit from the effective consultancy service it is therefore always better from professional stock trading companies rather than getting lured by discount brokerage advertisements that you must be coming across everyday.