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Do money markets fluctuate during market crashes?
As the commenters have already indicated, money market mutual funds are not guaranteed to maintain principal during all market conditions, and investments in mutual funds are not insured against loss due to market changes. That said, you can run a price search on Vanguard's website and see these results: So, despite all the economic problems since 1975, VMMXX has never traded at a price other than $1.00.