I Built an Investment Simulator That Models the Journey - Not Just Compound Interest

说明与用途

该工具模拟完整的投资路径，考虑实际操作，并使用Shapley分析归因每个决策的影响。

问题

Traditional investment calculators simplify returns to a single compound‑interest equation, ignoring real‑world actions such as SIP step‑ups, pauses, lump sums, withdrawals, rebalancing, taxation, inflation, and changing timelines.

结果

The simulator enables users to model complex investment journeys, view real‑wealth outcomes, and understand the combined effects of multiple decisions, thereby improving investment planning accuracy.

工作流

• 1. Install the package via pip install investment-journey-simulator or run the live Streamlit app.
• 2. Define investment parameters: monthly SIP, step‑up schedule, lump sums, withdrawals, rebalancing rules, tax assumptions, and inflation rate.
• 3. Set multiple horizon checkpoints (e.g., 5, 10, 15, 25 years).
• 4. Run the simulation to generate portfolio trajectories.
• 5. Use the Shapley‑based attribution feature to quantify each decision’s impact across all combinations.
• 6. Compare different plans or the same plan at different start times to evaluate trade‑offs.
• 7. Validate results against real‑world data or adjust assumptions as needed.

证据

The simulator models contributions, SIP step‑ups, pauses, lump sums, withdrawals, rebalancing, taxation and changing timelines as part of one investment journey rather than treating investing as a single compound‑interest equation.

来源

It evaluates how each decision contributes across different combinations, then allocates the interaction effects so the individual contributions reconcile with the actual outcome gap.

来源