You may have seen a TV ad where "traders" describe their strategies, and one says, "I trade on fundamentals." That sounds very reassuring -- except that, on any given day, "fundamentals" are a mixed bag:

You might have a good U.S. employment report...but bad news from Europe
A positive Fed statement...but a negative housing number
Strong earnings...but slowing consumer spending

Over the past few years Forex traders have really had to step up their game in order to continue making money in the currency market. Back in the day before currency trading was main stream, currencies used to trend in a direction for a long period of time with a low level of volatility.