Long-Term Wealth — Compounding Over Decades

Compound Growth

The Most Powerful Force in Finance

Einstein reportedly called compound interest the eighth wonder of the world. Whether or not he said it, the maths is undeniable. A single $10,000 investment earning 8% annually becomes $100,627 in 30 years — without adding another dollar.

The formula: A = P(1 + r/n)^nt. But the practical insight is simpler: start early, contribute consistently, never interrupt compounding with panic selling.

Rule of 72

Divide 72 by your expected annual return to find how many years it takes to double your money. At 8%: 72 ÷ 8 = 9 years to double. At 6%: 12 years.

$100K

$10,000 invested at 8% over 30 years — 10× growth

→ Start investing the moment you have an emergency fund
→ Never sell during market downturns — time heals volatility
→ Reinvest dividends automatically to maximise compounding
→ Keep fees below 0.2% annually — they compound too (against you)
→ Add consistently — monthly contributions compound alongside principal

10Y

After 10 Years — $21,589

A $10,000 investment at 8% has more than doubled. The compounding curve has begun to accelerate.

20Y

After 20 Years — $46,610

The same investment is now worth 4.6× the original. Each dollar now earns far more than it did in year one.

30Y

After 30 Years — $100,627

10× the original investment. This is the exponential phase — the final decade accounts for more growth than the first two combined.

40Y

After 40 Years — $217,245

Starting a decade earlier nearly doubles the outcome. Time is the only variable that cannot be purchased.

Long-Term Wealth Building

The Most Powerful Force in Finance