An article header banner graphic titled "The Eighth Wonder of Trading: Compounding Returns" on a dark theme background. The left section displays the main title with the sub-headline "Small shifts today yield massive returns tomorrow" along with the Quantified Strategies logo, while the center and right feature embedded panel mockups showing a digital metrics dashboard laptop screen and a rising stack of physical coins next to an upward trending financial line chart.

The Eighth Wonder of Trading: Compounding Returns

ByOddmund Groette Trading

Today, we look at what the eighth wonder of trading is – compounding returns (the eighth wonder presumably said by Albert Einstein).

Most traders focus on entries, exits, win rates, and indicators. But sometimes the biggest difference in long-term returns comes from something much simpler: how small details move the needle.

Take the same trading strategy, but make a small change to increase the annual return 0.3%. The difference can be surprisingly large.

That difference is the power of compounding (and time).

What Is Compounding?

Compounding is often described as one of the most powerful forces in finance, but its impact is not always obvious when looking at individual trades.

A single profitable trade may look almost identical whether you use a fixed amount of capital or reinvest accumulated profits. The real difference appears over time.

Compounding is not so easy to see because it requires time to show. However, when it kicks in, your capital grows exponentially.

Compounding Strategy

We run the good old 200-day moving average crossover system for the S&P 500 from 1960 to today.

When we use a simple moving average, the CAGR is 6.86%:

An article header banner featuring the title "COMPOUNDING RETURNS STRATEGY" in prominent orange and dark grey typography on a crisp white background. The header highlights the subtitle "Trading Rules | Backtest | Performance", paired with the Quantified Strategies logo on the left and a minimalist layout.
Comprehensive strategy layout introducing the underlying trading rules, quantitative backtest parameters, and geometric compounding mechanics of reinvested portfolio returns.

If we switch to an exponential average (EMA), the average increases to 7.17% per year:

A multi-decade logarithmic line chart plotting a quantitative backtest for a compounding trading strategy from the early 1960s through 2026. Starting from an initial 100,000 baseline, the steadily climbing capital curve displays a final terminal portfolio equity value of 8,159,023, overlaid with a prominent QuantifiedStrategies.com watermark across the lower center.
Long-term algorithmic backtest chart illustrating the exponential expansion of an initial 100,000 capital baseline into a final terminal value of 8,159,023 via automated compounding rules.

However, over such long periods, even “small” improvements can drastically change the end result: your capital increases from 8.16 million to 9.88 million.

Takeaway

In compounding, returns are the engine, but time is the fuel:

Without returns, nothing compounds. But without time, compounding never has a chance to show its true power.

Returns start the compounding process. Time does the heavy lifting.

But many fail to reach any compounding potential, because the process gets “interrupted”. Many are looking for 15-20%+ strategies, which are almost impossible to achieve over many years without huge setbacks, but all they need to do is find solid 10% strategies and ensure they don’t disrupt the compounding process.

Slow and steady is the way to go.

I’ve got an Msc from Heriot-Watt University, Edinburgh (1996), in addition a to a business administration degree the Norwegian School of Management (BI – 1994). Did my mandatory military service in between.

After university, I worked two years as an auditor (1996-1998).

I co-founded Aksjeforum.com in 1998/99 - one of the first websites about trading and investing in Norway. It was later acquired by Digi.no in 2001.

I have written 4 books about trading (in Norwegian). One of them has sold 30,000 copies, a record for a financial book in Norway.

From 2001 until 2018 full-time independent prop trader (Series 7 in 2001) and investor.

2018-today: Investor, writer, analyst.

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