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Why I cannot find a “Pure Cash” option in 401k investments?
The short term bond fund, which you are pretty certain to have as an option, functions in this capacity.  Its return will be low, but positive, in all but the most dramatic of rising rate scenarios. I recall a year in the 90's when rates rose enough that the bond fund return was zero or very slightly negative. It's not likely that you'd have access to simple money market or cash option.