Although it's certainly true that not enough Americans are saving for retirement, it's also true that the many millions who are saving do so through an employer-sponsored defined contribution 401(k) plan. And as you may well know, 401(k) plans tend to generate a considerable amount of financial activity. The mobility of today's workforce means employees often request distributions when they move from one employer to another. Rollovers are common, too, as are hardship withdrawals.