Money Here’s how big stock market swings can boost your 401(k) retirement savings in the long run March 29, 2020March 29, 2020 Nancy Tengler, Special to USA TODAY Comments Off on Here’s how big stock market swings can boost your 401(k) retirement savings in the long run When volatility reigns, like now, 401(k) investors can actually benefit from adding to holdings in great companies that are suddenly selling cheaply.