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Here are some of the key criteria and indicators used to judge a market top:

 

Price and Volume Indicators：

On-Balance Volume (OBV)，Moving Averages (MAs)，Relative Strength Index (RSI)，Bollinger Bands

 

Market Breadth Indicators

Advance/Decline Line，McClellan Oscillator

 

Volatility and Sentiment Indicators

VIX Index (CBOE Volatility Index)，Put/Call Ratio