Allianz Global Investors’ head of strategy is warning that US stock market bubble indicators are ‘waving red flags’ and resemble the dot-com era — and shares when he thinks it could all come crashing down

It can be a difficult task to determine when exactly a market is in bubble territory. 
One indicator might flash warning signs, while another might show smooth sailing ahead.
But sometimes multiple negative signals start to pile up. According to Allianz Global Investors’ Head of Global Strategy Stefan Hofrichter, that’s what is beginning to happen.
In a Monday note, Hofrichter said there are several indicators that should concern investors. 
“As we have seen, most but not all of the criteria required…

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