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Why I cannot find a “Pure Cash” option in 401k investments?
Your employer decides what options you have in the 401k. You can talk to your HR about that. There are requirements for diversity of various types of investments, money-market funds is being one of them. That is the investment account equivalent of cash. While it is not really cash but rather short term bonds - the term is generally very short and the risk is very limited. You can't earn much there, and you can't lose much there - so for all intents and purposes you can treat is as a cash-equivalent.