InvestingBeginner5 min read
The magic of compound growth
The single most important idea in investing, demonstrated with numbers that seem fake but aren't.
Compound growth is the financial equivalent of gravity — gentle, constant, and dramatically consequential over long enough timescales. It's also counterintuitive. Humans are built to think linearly, and compound growth is exponential, so the numbers start normal and end absurd.
A simple example
$1,000 invested at an average 8% annual return. Not compounded: in 30 years, it's worth $3,400 (the original plus $80/year × 30). Compounded: in 30 years, it's worth $10,062. Same rate, triple the outcome. The extra $6,662 came from interest earned on previous interest.
Starting early matters more than contributing more
Twin A invests $5,000/year from age 22 to 32, then stops. Twin B invests $5,000/year from age 32 to 62. At age 62, assuming 8% returns, Twin A has MORE money than Twin B — despite contributing only a third as much. Time did the heavy lifting.
The practical takeaway
- Start investing as early as you can, even with small amounts.
- Don't interrupt compounding unless you have to. Selling and re-buying resets nothing — but cashing out for non-essentials does.
- Trust the boring process. You will not feel rich for the first 5 years. That is normal. Year 15 is when the curve visibly bends.
Put this into practice
Worth tracks your accounts, budgets, and goals — so the concepts in this article aren't just theory.
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