When you are trying to decide which type of currency to invest in, you may analyze charts and graphs depicting the current and historical values of these and other currencies. In addition, you can educate yourself about the types of news and events that impact currency value. Many newer investors will make investments based on the currencies and markets they are most familiar with, such as the U. S. dollar or the Great Britain pound. These are commonly traded because they are in the popularly talked about in the news as well as because the values of these and other highly traded currencies fluctuates frequently over the course of time.