As we noted before, fundamental analysis offers the best guidance for determining price trends. To give a simple example, in a stable economic environment, with good economic growth, and healthy employment statistics, central banks are almost certain to respond to high inflation with interest rate increases, to which the markets will usually react by buying and favoring the currency of the nation in question. And as central banks seek credibility in their actions, and are not very likely to zigzag with their rate decisions, the trader can anticipate the beginning of a long term trend through his analysis of the central bank's policies and goals, and by following his analysis, he can realize profits.

Of course, there's a lot more to be said about this subject, but the basic principles are simple. The attention span of the market is not long enough to fully evaluate the significance of fundamental developments, and economies absorb changes to fundamental values slowly and gradually. There's ample time for the trader to profit from such changes, once he's aware of them, even if he catches the trend after it's fully underway.

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