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SpanishPortfolio Choice, Trading, and Returns in a Large 401(K) Plan
By Pierluigi Balduzzi (Boston College), Julie R. Agnew (College of William and Mary) & Annika E. Sundén (Stockholm University)
This paper examines portfolio choice, trading behavior, and realized rates of return of more than seven thousand 401(k) retirement accounts during the April 1994-August 1998 time period. The evidence on equity allocations is indicative of prudent behavior: on average our investors hold 40% of their 401(k) portfolios in stocks. In addition, patterns of stock allocations by marital status, age, and earnings are broadly consistent with the implications of normative models: stock allocations are higher for married investors, for younger investors, and for investors with higher earnings. The evidence on trading activity indicates very limited portfolio re-shuffling, which stands in sharp contrast to existing evidence from discount brokerage accounts: 70% of the plan participants do not rebalance their portfolio more than once, average re-balancing frequency is one trade every 33 months, and average monthly turnover is in the order of 2%. This evidence is consistent with the implications of models of optimal portfolio choice with realistic transaction costs.
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