A Best forex trader will easily fathom the over extended market even if you do not have enough source to compare the current price. Incase you are unable to tackle the situation then you can depend on RSI or MACD in order to analyze whether the price is overbought or oversold. If you want to determine the momentum of the market then the overbought or oversold indicator is useful.
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see complete article at :
http://www.fxstay.com/forex-basics/...t-of-view-of-a-professional-forex-trader.html