Compounding
The snowball effect of earnings piling on top of earnings — the core principle of long-term investing, whose force grows explosively the longer the time.
Compounding = the profit earned by the principal is added back to the principal, and further profit accrues on top of that
The higher the return and the longer the period, the greater the compounding effect.
In plain terms
Compounding is the effect of "earnings producing earnings." If $1,000 earns 10% and becomes $1,100, the next year another 10% is applied to $1,100. Earnings stack on earnings and grow like a snowball.
Compounding gets bigger the longer the time. It's slow at first, but the amount added grows quickly later on. So even with the same rate of return, a different holding period leads to a very different outcome.
What it tells you
Compounding explains "why long-term investing is powerful." A rate of return that looks minor over a short span makes a huge difference once it accumulates over many years.
So with compounding, the period invested and consistency shape the outcome as much as the rate of return does. A large loss along the way breaks the chain of compounding.
Formula
Compounding = the profit earned by the principal is added back to the principal, and further profit accrues on top of that e.g. at 10% a year, the principal roughly doubles in about 7 years (growing far faster than simple interest)
What high or low means
The higher the return and the longer the period, the greater the compounding effect. Its force grows exponentially especially as the period lengthens.
Conversely, a large loss is fatal to compounding. Lose 50% and you need a 100% gain just to get back to even, so "protecting what you have" is what keeps compounding alive.
Compounding isn't magic — it needs "time." Expecting big compounding over a short period easily leads to overstretched bets. The friend of compounding is patience, not impatience.
If chasing high returns leads to a large loss, compounding works in reverse (losses compound too). That's why, even with the same average return, one big loss mixed in changes the final outcome greatly.
Warren Buffett's wealth is the most famous illustration of the power of compounding. Most of his enormous fortune was actually accumulated after he passed the age of 60. He invested from early on, but compounding grows explosively as time piles up.
Buffett compared his success to "rolling a snowball" — what matters is not the small snowball at the start, but rolling it without stopping down a long enough hill (time). It's a story that shows why starting early and leaving it for a long time is so powerful.
Metrics to read alongside
See it in real stocks
Search US stocks on Stocklore to see SEC-filing-based financial metrics alongside the sector benchmark.
This explanation is for information and reference only and is not a recommendation to buy or sell any security. Investment decisions and their consequences are your own.