Week 19 Day 7: Set It, Forget It, Get Rich Slowly

Complexity is the enemy of follow-through. The more complicated your investment strategy, the more likely you are to second-guess it, tinker with it, or abandon it during a downturn. A boring three-fund portfolio that you automate and never touch will outperform 90% of investors who constantly adjust, optimize, and overthink.

Dalbar, Inc. studies the gap between fund returns and investor returns. From 1993-2022, the S&P 500 returned 9.65% annually. The average stock fund investor earned 6.81%. That 2.84% 'behavior gap' comes from buying high (after markets rise, investors pile in) and selling low (after markets crash, investors flee). Over 30 years, 9.65% turns $10,000 into $159,000. 6.81% turns it into $72,000. The behavior gap cost the average investor more than half their potential wealth. The solution: automation. Set up automatic monthly contributions to your index funds. Turn on dividend reinvestment. Set a rebalancing schedule (once per year is fine). Then stop looking at your portfolio more than quarterly. Every study shows that the less frequently investors check their portfolios, the less likely they are to make emotional decisions. Benartzi and Thaler recommend checking annually at most. The goal is to make investing as boring as paying your electric bill. Boring is profitable.

The behavior gap is the single largest destroyer of individual investor wealth. Kinnel (2014) at Morningstar confirmed the Dalbar findings using a different methodology: the dollar-weighted return (which accounts for cash flow timing) of the average fund investor lagged the time-weighted return of the funds they owned by approximately 1.5-2.0% annually. The causes are well-documented: performance chasing (Sirri and Tufano, 1998, showed that fund inflows are strongly correlated with recent performance), loss aversion (Kahneman and Tversky, 1979), and narrow framing (evaluating each investment individually rather than in portfolio context). Interventions that work: (1) automatic enrollment and escalation in 401(k) plans (Madrian and Shea, 2001, showed participation increased from 49% to 86% with auto-enrollment), (2) target-date funds as the default option (removes all allocation and rebalancing decisions), (3) reducing portfolio monitoring frequency. Ameriks, Veres, and Warshawsky (2001) found that investors with a written financial plan earned better risk-adjusted returns than those without -- not because the plan was optimal, but because it reduced emotional decision-making. The meta-lesson: the primary value of financial literacy is not selecting better investments. It is developing the behavioral discipline to stick with a simple, low-cost plan.