What's left after fees and inflation?
Third correction: the return you SEE is not the return you KEEP. Two subtractions stand between the headline and your purchasing power — one loud, one silent.
The loud one: fees
A 1% annual fee sounds like a rounding error. Run it through compounding's machinery: €1,000 for 40 years at 7% grows to about €14,970; at 6% (same market, minus the fee) — about €10,290. The "small" fee consumed roughly a third of the final wealth. Fees compound with exactly the same explosive curve as returns — just against you. This single computation explains one of Course 2's facts: why low-cost index funds became the biggest pool of invested money on Earth — the cheapest ticket to the same compounding curve keeps the most of it.
The silent one: inflation
You own the macro course's glasses already: subtract the era's inflation to get the real return. A 7% nominal year during 3% inflation is a 4% real year — the number your future groceries obey. Historically, equity investors' oft-quoted long-run returns shrink by a third to a half once restated in real terms; they remain positive over long horizons, which is precisely why patient stock ownership has historically outrun mattresses and savings accounts — but the honest number is the smaller one.
The full waterfall
Headline return → minus fees → minus inflation → what you actually keep, in purchasing power. (Taxes take their slice too — rules vary by country, so the Academy leaves that line to your local specifics; just know the waterfall has a fourth step.) Any return discussed WITHOUT this waterfall is marketing, not measurement.
In the data
Both subtractions are published. The loud one is the fund's expense ratio; here is SPY's, beside its dividend yield and its return over the past year:
The fee is printed as a fraction of your money, not as a percentage: 0.00095 is 0.095% a year, roughly nine and a half basis points. The silent subtraction is the inflation series you met in the macro course, one number a year:
Try it now
- Waterfall practice: nominal 8%, fee 1.5%, inflation 3%. Real net return?
- Now do it with a real fee instead of an invented one: SPY's, the first row of the fund table above, a fraction, so 0.00095 means 0.095% a year.
Leave it as the fraction and multiply straight by €10,000 — that is what a year in the fund costs you, and it is under a tenner. Do the same for a 1.5% active fund, whose fraction is 0.015. Two numbers, and the ratio between them is the argument that moved trillions. 3. Notice which multiplication you did NOT do. Converting to a percentage first and then multiplying by €10,000 gives a figure a hundred times too large, which is this trap arriving by the back door in your own arithmetic — a percentage and a fraction are one factor of 100 apart and only one of them belongs in a money calculation. 4. Watch where that trap comes from. The dividend yield and the one-year return, the second and third rows of the fund table, genuinely are percentages, so one table mixes both conventions with nothing but the labels to mark the boundary. Read the expense ratio the way you read its neighbours and you have inflated the fee a hundredfold. 5. Rerun the rule of 72 on fees: at a 2% annual fee, how long until costs alone have consumed roughly half your money's potential doubling? 6. Say it aloud: "fees compound against me on the same curve that returns compound for me."