A surprising number of 401(k) plans default to a money market fund for invested assets. Imagine retiring after a decades-long career and realizing what could have been.
If I remember this article correctly https://www.wsj.com/personal-finance/retirement/the-401-k-ro..., the summary is some peoples' 401k accounts are not invested in the stock market. Rather the money sits for years collecting interest, growing far less.
I believe they mean realizing that if you had invested into stocks instead of money market you'd have likely realized a quite large return. Money markets seek to keep your returns to around inflation.
I'm not following what this means. Can you please elaborate?