Investment Fee Drag, explained.
Investment fee drag is the reduction in accumulated wealth caused by investment charges and the subsequent returns that the removed capital no longer earns. Direct fees and the final wealth gap are different quantities.
Why it happens
Each annual deduction lowers the amount available for later compounding. The no-fee comparison therefore diverges by more than the sum of charges when positive growth continues. The timing and fee base affect the calculation.
Investment fee drag includes fees paid and the future growth those removed amounts no longer earn. Small recurring percentage costs can accumulate over a long horizon.
Read the result
Hold return and horizon fixed while comparing the fee presets. Read Fees actually paid separately from Final balance gap. The model first grows the balance, then charges the fee against that year's resulting amount.
A worked example
One annual charge and its next-year consequence
Begin with 1,000 tokens and a 6% gross return; before the first fee, the balance is 1,060.
A 1% charge removes 10.60, leaving 1,049.40 to participate in the next period.
The removed 10.60 also misses later growth. Compare both direct fees and the ending gap rather than treating the first charge as the whole cost.
OPTIONAL DEEPER DETAILGo deeper: inside the model
Inside this model
Start at 1,000 tokens. Each year first applies the stated gross return, then deducts the fee as a percentage of that year's resulting balance. A no-fee portfolio uses the same return. The dashboard separates fees paid from the total final-balance gap.
Where this idea is useful
A practical use
Compare a 1% fee with a 0.2% fee while keeping return and time identical; inspect both direct charges and foregone growth.
A common misconception
“The cheapest service must be the best service.”
A cost comparison alone does not establish service quality, risk, suitability, or outcomes. The board holds gross returns equal to isolate the arithmetic of costs.
What this explanation leaves out
- Constant returns and annual deductions simplify real products. No service quality, taxes, transaction costs, or market outperformance are inferred; a fee is not itself evidence of a poor service.
Is subtracting the fee from the return exact in this board?
No. Because the fee is applied after growth, the net factor is (1+return)×(1−fee). Other products may use different timing and charging conventions.
Which recurring charge looks small per period but deserves evaluation over the full period you expect to use the service?
Associated thinkers
Associations marked provisional are awaiting source review.
Further reading
Explore the original research or the teaching reference behind this experiment.