Bitcoin & money learning · Retrospective
Make fee assumptions visible in a projection
Show the calculation without implying a return forecast.
Source foundation
Investment fund fees and expenses reduce investor returns. Investor.gov: fund fees and expenses.
A worked example
In a simplified no-growth illustration, a 1,000-unit starting balance is reduced by 1 percent at each year-end. It becomes 990 after year one and 980.10 after year two. This isolates the arithmetic of a recurring percentage deduction and deliberately excludes returns, deposits, taxes, and other costs.
Original hypothetical example. Amounts, people, events, and scenarios above are invented for learning; they are not historical observations or forecasts.
What to take from it
A model should say what it excludes as plainly as what it calculates.
Try it on paper
Recalculate two years using a hypothetical 0.5 percent deduction.
Keep the assumptions beside your answer. Check the result before applying the idea to a different situation.
Reading and limits
The linked source supports the foundation statement. The worked example and exercise are NAKAMOTO's educational analysis. This note does not establish current prices, product terms, investment suitability, or wallet compatibility.
Source reviewed 13 September 2026. For operational decisions, consult the current official documentation and the details of your own circumstances.