Portfolio performance in 401(k) plans depends on both the investment menu made available by plan sponsors and participants portfolio decisions. We use a unique dataset of nearly 1 million participants in one thousand pension plans to identify key portfolio inefficiencies in 401(k)...

Important behavioral factors such as default and framing effects are increasingly being employed to optimize decision-making in a variety of settings, including individually-directed retirement plans. Yet such approaches may have unintended "spillover" effects, as we show with regard to the...

Target date funds in corporate retirement plans grew from $5B in 2000 to $734B in 2018, partly because federal regulation sanctioned these as default investments in automatic enrollment plans. We show that adopters delegated pension investment decisions to fund managers selected by plan...

We develop a comprehensive model of 401(k) pension design that reflects the complex tax, savings, liquidity and investment incentives of such plans. Using a new dataset on some 500 plans covering nearly 740,000 workers, we show that employer matching contributions have only a modest impact on...

Tax-qualified retirement plans seek to promote saving for retirement, yet most employers permit pre- retirement access by letting 401(k) participants borrow plan assets. This paper examines who borrows and why, and who defaults on their loans. Our administrative dataset tracks several hundred...

Most active 401(k) participants have the option of borrowing from their retirement accounts, and nearly 40 percent do so over a five-year period. We show that employers' loan rules have a strong endorsement effect on borrowing patterns; that is, in plans allowing multiple loans, participants are...

Most workers in defined contribution retirement plans are inattentive portfolio managers: only a few engage in any trading at all, and only a tiny minority trades actively. Using a rich new dataset on 1.2 million workers in over 1,500 plans, we find that most 401(k) plan participants are...

In an effort to improve 401(k) portfolio choices, many US plan sponsors are offering target maturity date (TM) lifecycle funds, which place younger workers into higher-equity-share portfolios and then automatically rebalance them into more conservative holdings as they near retirement age. Our...

Few previous studies have explored how individuals manage their defined contribution (DC) pension plan assets, though these plans constitute an increasingly important component of retirement wealth. Using a valuable new dataset on over one million active 401(k) plan participants in a wide range...

This paper explores why plan sponsors design their 401(k) plans the way they do. Employing a unique, rich dataset of over five hundred 401(k) plans, we find that these plans are principally a form of tax-motivated compensation under the restriction of federal non-discrimination rules. In other...