Shlomo Benartzi and Richard H. Thaler examine heuristics and biases in retirement savings behavior. Retirement plans are shifting from defined benefit to defined contribution plans, which offer flexibility but require more responsibility. Standard economic theories assume rational decision-making, but behavioral biases often lead to suboptimal choices. Employees often use heuristics, such as automatic enrollment, to simplify decisions. Automatic enrollment increases participation rates, as seen in studies where enrollment jumped from 20% to 90% after implementation. However, some employees may save more than they intended, suggesting that automatic enrollment helps them make better choices. Employees also face biases in contribution rates. Many believe they are saving too little, and some use heuristics like saving the maximum allowed or contributing enough to get the full employer match. However, changes in tax laws can affect these heuristics. For example, raising the maximum contribution rate from 16% to 100% led to a decrease in contributions, as some employees switched to a different heuristic. Employees also face biases in asset allocation, often choosing naive diversification strategies like the 1/n rule. This can lead to overexposure to equities or company stock, which is riskier than diversified portfolios. Company stock is a common choice, but it is risky and often misunderstood by employees. Many believe it is safer than other investments, despite its higher risk. Employees also exhibit myopic loss aversion, focusing on short-term returns rather than long-term gains. Peer effects also influence retirement decisions, as seen in studies where employees followed the investment choices of their colleagues. Defined contribution plans allow for more flexibility in savings and investment, but employees often make suboptimal choices due to biases. Studies show that employees who opt out of default investment options often perform worse than those who use professionally managed accounts. The Swedish social security system, which allowed employees to choose their own portfolios, saw lower performance in active portfolios compared to the default fund. Employees also face challenges in choosing between defined benefit and defined contribution plans. Many opt for the default defined benefit plan, even though it may not be the best choice for their situation. Studies show that employees often overestimate their expected tenure with the employer, leading to suboptimal decisions. Plan sponsors can improve retirement decisions through education and plan design. Education helps employees understand their options, while plan design can simplify choices and encourage better savings behavior. Interventions like automatic enrollment and default savings rates can increase participation and contribution rates. However, employees still face biases in asset allocation and contribution rates, highlighting the need for continued research and policy improvements.Shlomo Benartzi and Richard H. Thaler examine heuristics and biases in retirement savings behavior. Retirement plans are shifting from defined benefit to defined contribution plans, which offer flexibility but require more responsibility. Standard economic theories assume rational decision-making, but behavioral biases often lead to suboptimal choices. Employees often use heuristics, such as automatic enrollment, to simplify decisions. Automatic enrollment increases participation rates, as seen in studies where enrollment jumped from 20% to 90% after implementation. However, some employees may save more than they intended, suggesting that automatic enrollment helps them make better choices. Employees also face biases in contribution rates. Many believe they are saving too little, and some use heuristics like saving the maximum allowed or contributing enough to get the full employer match. However, changes in tax laws can affect these heuristics. For example, raising the maximum contribution rate from 16% to 100% led to a decrease in contributions, as some employees switched to a different heuristic. Employees also face biases in asset allocation, often choosing naive diversification strategies like the 1/n rule. This can lead to overexposure to equities or company stock, which is riskier than diversified portfolios. Company stock is a common choice, but it is risky and often misunderstood by employees. Many believe it is safer than other investments, despite its higher risk. Employees also exhibit myopic loss aversion, focusing on short-term returns rather than long-term gains. Peer effects also influence retirement decisions, as seen in studies where employees followed the investment choices of their colleagues. Defined contribution plans allow for more flexibility in savings and investment, but employees often make suboptimal choices due to biases. Studies show that employees who opt out of default investment options often perform worse than those who use professionally managed accounts. The Swedish social security system, which allowed employees to choose their own portfolios, saw lower performance in active portfolios compared to the default fund. Employees also face challenges in choosing between defined benefit and defined contribution plans. Many opt for the default defined benefit plan, even though it may not be the best choice for their situation. Studies show that employees often overestimate their expected tenure with the employer, leading to suboptimal decisions. Plan sponsors can improve retirement decisions through education and plan design. Education helps employees understand their options, while plan design can simplify choices and encourage better savings behavior. Interventions like automatic enrollment and default savings rates can increase participation and contribution rates. However, employees still face biases in asset allocation and contribution rates, highlighting the need for continued research and policy improvements.