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Compound Interest

Compound interest means your returns are earned on both your original money and on past returns. Over long periods, this creates accelerating growth.

Why this matters

Compounding is one of the biggest drivers of long-term wealth. Time and consistency often matter more than finding one perfect trade.

Simple example

If $10,000 grows at 8% per year, year-1 gain is $800. In year 2, growth applies to $10,800, not just the original $10,000.

Common mistakes

  • Underestimating how much time matters in compounding.
  • Withdrawing too early and breaking the compounding cycle.
  • Confusing nominal growth with inflation-adjusted (real) growth.

Related terms

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Next step

Open next step: Model your own compounding path with monthly contributions