Costs & risk
The Arithmetic of Fees
What do recurring costs do to long-horizon wealth?
How recurring costs, inflation, and allocation assumptions affect long-horizon wealth.
Identity + modeled Evidence reviewed: July 2026
Method, interaction, and boundary
- Method
- Monthly cash-flow recursion and seeded return paths
- What you can explore
- Change contributions, horizon, allocation, inflation, returns, and fee levels.
- Boundary
- No taxes, withdrawal phase, stochastic inflation, or individualized portfolio constraints.