The relative strength index (RSI) is a popular momentum oscillator introduced in 1978. The RSI provides technical traders with signals about bullish and bearish price momentum, and it is often plotted beneath the graph of an asset’s price. An asset is usually considered overbought when the RSI is above 70 and oversold when it is below 30. The RSI line crossing below the overbought line or above oversold line is often seen by traders as a signal to buy or sell. The RSI works best in trading ranges rather than trending markets.
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