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Team Cocco Financial Planning

The Behavior Gap Calculator

The biggest threat to your retirement isn't the market — it's you. This tool quantifies the cost of emotion-driven investing versus the discipline of a long-term plan.

Inputs

Investment
%
Behavior
3.5%
DALBAR 30-yr avg ≈ 3.5 pts
2
Each major panic ≈ +0.5 pts of gap

Teaching Scenarios

Market Return vs. Average Investor Return
$100,000 over 30 years · 10.3% market · 3.5 pt gap
Your Behavior Gap Costs
$0
over 30 years — money left on the table by emotion
🎯
Disciplined Investor
Full market return — stays the course
$0
at 10.3%/yr
😰
Behavior-Gap Investor
Market return minus the gap
$0
at 6.8%/yr
DALBAR · 20-Yr Investor Underperformance vs. Benchmark (2024 edition)
Benchmark Index Return Avg. Investor Behavior Gap
S&P 500 (Equity Funds) 10.15% 6.81% −3.34%
Bloomberg Agg (Fixed Income) 4.20% 0.64% −3.56%
60/40 Asset Allocation 7.85% 5.02% −2.83%
Inflation (CPI) 2.85%
The Five Common Behavior Errors

1. Recency Bias

Believing the recent past predicts the future — chasing whatever just went up.

2. Loss Aversion

The pain of losing $1 feels 2× stronger than the joy of gaining $1 — drives selling at lows.

3. Herd Mentality

Doing what everyone else is doing — buying tops in euphoria, selling bottoms in panic.

4. Anchoring

Fixating on an irrelevant reference point — "I'll sell when it gets back to what I paid."

5. Overconfidence

Believing you can outsmart the market through timing, stock picking, or "knowing when to get out." Statistically, almost no one can.

— Carl Richards' Famous Napkin —
What investors SHOULD do vs. what they ACTUALLY do
The Conversation: The biggest threat to your retirement isn't the market — it's you. The S&P 500 averaged 10%+ over the last 30 years, but the average equity-fund investor captured only 6.8%. That 3.5-point gap, compounded over a lifetime, is the difference between a comfortable retirement and running out of money. The job of your advisor is to keep you from being the average investor. That's the alpha most people never see on a statement, but it's the alpha that matters most.