Decision Library
Should I Make This Purchase, or Invest the Money?
A big discretionary purchase competes directly with what that same money could grow into if invested instead — seeing the actual number changes how "worth it" a purchase feels.
Run the Numbers
Calculate Your Own Scenario
It could be worth
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What you actually spent
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Growth missed out on
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How This Changes If Returns Differ
| Scenario | Return | Could be worth |
|---|
Scenarios
How This Usually Plays Out
- A one-time purchase you'll use for years (a laptop, furniture) — the opportunity cost is real but so is the value you get back.
- A purchase driven mainly by a sale, a trend, or social pressure — this is where the forgone-growth number tends to sting the most.
Risks & Exceptions
When the Normal Advice Doesn't Apply
- This only measures the financial trade-off — some purchases (health, safety, a genuine need) aren't really optional regardless of what the number says.
Decision Framework
How to Actually Decide
- Run the actual amount through the calculator above before deciding.
- Ask whether you'd still buy it if you had to pay the "growth missed" amount as a visible fee on top.
- If yes, buy it without guilt — this tool is for catching impulse spends, not banning all spending.
This page is for educational purposes only and does not constitute financial advice. Figures are illustrative and vary based on your individual circumstances, lender policies, and market conditions. Always consult a certified financial advisor before making major financial decisions.