What’s the peak?
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Are there some "special" circumstances assisting people to think like that (there won’t be a pump further)?
you can tell the price was at its peak after a significant drop that last for awhile
so the peak is known only afterward not before or ontime, it is confirmed by a sizeable price drop
you can only guess its peak and a possibility of price drop when the market is overbought
too many sellers than buyers, buy volume is decreasing overtime, and other technical analytical stuff