• If prices move below a Fibonacci Fan trendline, then price is usually expected to fall further until the next Fibonacci Fan trendline level; therefore, Fibonacci Fan trendlines are expected to serve as support for uptrending markets (see: Support & Resistance).

• Likewise, in a downtrend, if price rises to a Fibonacci Fan trendline, then that trendline is expected to act as resistance; if that price is pierced, then the next Fibonacci Fan trendline higher is expected to act as resistance.

The chart below of the S&P 500 exchange traded fund (SPY) shows an uptrend that retraced to the 38.2% Fibonacci Fan:

The Fibonacci ratio is also used to predict areas of time in which price should change course; Fibonacci Time Extensions are discussed next.