To put up something concrete, my last large employer had a 401k plan where the cheapest fund we had access to (PLFMX) had an expense ratio of 0.72%. That's in a

To put up something concrete, my last large employer had a 401k plan where the cheapest fund we had access to (PLFMX) had an expense ratio of 0.72%. That's in addition to account-level management fees, which I think were ~0.8%.