When the time comes to invest one of the more popular financial instruments for people 
are stocks. These are assets that can appreciate in value very quickly, but there is the risk that they will also lose value in a big hurry. Taking the chance to make big money also involves risking big money, and this is something that any investor knows well. Ask any experienced, take Timothy Sykes for example, they will tell you the same thing. There is a wide array of different equities (stocks) available to choose from, and they exist on several different international markets. These markets keep hours between Monday and Friday with an open for the day as well as a close. Making sure that a given stock has a decent chance of rising or falling is something to be determined by either the investor or their broker. There are various forms of pattern (technical) trading in addition to fundamental influences that can cause a stock to rise or fall. Balancing the various influences that can impact stock prices and taking them into account during a trade is the job of either the investor or their broker. While there is no way to predict the future there are definitely some ways to predict (with some accuracy) the likely movements of a stock in a given trading period.
IPOs or Initial Public Offerings are a popular time for many people to buy stock since this is a time that the value can rise dramatically. Likewise if there is some really positive news about a company that is likely to be announced some time in the near future it is a good idea to invest in that stock. Other things that can impact stocks are commodity prices, this is due in great part to manufacturing costs that rise and fall for a company. Oil is the single largest commodity force that can influence many different stocks, especially oil companies. When the price of oil rises (typically) the value of oil companies rises while the value of companies that use oil in production falls. This is because investors have a tendency to sell stock when they know a company will struggle with rising oil prices. It is influences like this that need to be tracked and taken into account every day, otherwise things can end up going wrong in a big hurry. Keeping an eye on these developments and the level of the stock on a minute to minute basis is the job of the broker/trader.