Following are common things one can spot on weekly chart which happen before fall/crash of 2008 and 2020, similar thing can be found in other indices and on all time frames in chart
1. Price will continue to make higher high RSI or MACD indicators will show trend exhaustion with lower high not breaking previous high
2. Series of Negative divergence is seen on chart, look for 3 or more (RSI is leading indicator will produce more divergences compared to MACD)
3. Look for Head and Shoulders or Rising wedge or double top pattern on chart at top of trend
4. Finally Divergence line is broken out upside signaling final move started, that's exit signal 1.
5. Rsi will break line again downside and MACD crosses below signal line, that's exit signal 2.
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Good clear chart and idea with good clear explanation.