For over 2 years, the 38-42% line on a 12 day RSI has provided support for the RIO share price on no less than about 12 occasions. Only twice has that zone failed to support the price. On one of those occasions, the price fell another $8 ($73 to $65 in Jan 2010). The other time it fell another $17 ($76 to $59 in May 2010).
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