Compound interest – The Eighth Wonder of the World

Albert Einstein reportedly said it. “Compound interest is the eighth wonder of the world. He who understands it, earns it. He who doesn’t, pays it.”

Regardless of whether Einstein uttered these exact words, the essence of his statement is still immensely powerful and cannot be disputed. For anyone who wants to build lasting wealth, understanding and harnessing the power of compound interest is essential. So, what is compound interest? Well, it is the exponential increase in the value of an investment. Or, more simply put, it is the interest that you earn on your interest.

For the more visual of you, imagine, if you will, building the bottom part of a snowman. It starts with a snowball (or initial investment). You roll it around in the snow and it slowly gets bigger (interest on the investment). A slow and monotonous process until something wonderful becomes apparent – the snowball not only gets bigger and bigger, but at a faster and faster rate (interest on the interest).

Put another way, let’s say that you invest €100,000 at (just to keep the maths simple) 10% interest per year. After the first year, you would have earned €10,000 of interest, with your total investment now worth €110,000. After the second year, your 10% annual return would have earned you another €11,000, giving you a total of €121,000. Year three would see your investment rise to €133,100. Over time this growth accelerates, meaning that you would double your initial investment in approximately seven years, simply by harnessing the power of compound interest. Sounds pretty easy, yes? So, why don’t more people do it? Well, for two main reasons, in my experience:

The key requirement for generating compound interest is time – the longer you leave your money to grow, the more pronounced and positive the outcome. Modern times have encouraged us to expect immediate rewards. For many, being told that it will take a good few years to see significant returns on their investments can be demotivating.

Another common reason is “it’s a bad time right now.” In the 1970s we experienced record breaking levels of inflation, in the 1980s Black Monday brought the biggest stock market crash since the 1920s. The 1990s saw a period of sustained recession. Currently, there are many economies around the world that are still recovering from the financial crisis of 2008, almost ten years on. Yet the stock market performs over time and continues to do so. The timing of an investment is far less important than the time that is allowed for it to deliver.

Essentially, having a long term investment strategy – allowing growth to be achieved over time – provides the best possible opportunity to achieve financial security for you and your loved ones in later years. With compound interest, the old Chinese proverb holds true. “The best time to plant a tree was twenty years ago, the second best time is now.”