Your http://moneymorning.com/tag/alibaba-stock/ investment target company may merge, re-organization, goal tender offers, or perform other actions that could reduce the value of your holdings. For that you must have full attention on the news or announcement about the possibility. Conditions in general Stock Exchange and any stock in particular have a tendency (trend) the price and sales volume that describes the best time to conduct buy / sell. Analysis, known as “technical analysis “this needs to be studied by investors because it would greatly affect the decision of investors to buying / selling transaction. for this, you can obtain data from research institutes or from the research division of your Securities Company.
On a macro scale, the performance of an investment in the Securities Exchange greatly affected by economic conditions, political stability, and performance of other Exchange. In addition, the circumstances in the stock is very sensitive to things subjectively ( rumors). you have to follow the news of this kind which certainly can affect the value of your investment.