Emergency funds are always for emergencies. No good investor would encourage anyone to invest part of all of his emergency fund simply because of Dip. Market volatility has no time frame and could be as short or long as no one would actually predict. Emergency funds toe is no longer your fund, it's set aside for life sake.

The current situation of bitcoin is a great opportunity for investors. Maybe traders would finally decide to quit trading for investment this time.
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Emergency is not set aside just for life's sake... Emergency fund is for contingencies - good or bad...It's wise to use one's emergency fund in case of dip irrespective of how long or short that dip could be. Great investors will always take advantage of dips even as they still invest during boom. There's no way I will not buy more bitcoins during dip. I operate based on DCA, but dip is when I break the records. I'll still set up emergency funds if I ever get to use them up.