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Should Forex Traders Use Trading Systems and Signals?

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Many traders wonder whether it is worthwhile to buy into a system or a signal package. System and signals fall into three general categories depending on their methodology: trend, range or fundamental. Fundamental systems are very rare in the FX market; they are mostly used by large hedge funds or banks because they are very long term in nature and do not give many trading signals. The systems that are available to individual traders are typically trend systems or range systems - rarely will you get one system that is able to exploit both markets, because if you do, then you have pretty much found the holy grail of trading.
Source: http://www.investopedia.com/articles/forex/06/FirstStepsFX.asp; http://www.bktraderfx.com/site/members-benefits; http://www.gftforex.com/