Why the Smartest Man in History Lost a Fortune in the Stock Market
The smartest man in history lost a fortune in the stock market. Isaac Newton, the brilliant mind behind calculus and the laws of motion, suffered significant financial losses despite his extraordinary intellect. His downfall wasn't owing to a lack of understanding but rather his investment in the South Sea Company.
Newton's experience reveals an important lesson for your investment trip. Intelligence alone doesn't guarantee success in financial markets. Even the smartest man in the world in history fell victim to common investing pitfalls that continue to trap investors today.
This piece goes into detail about Newton's investment disaster, explores why brilliant minds can make poor financial decisions, and uncovers lessons you can apply to avoid similar mistakes in your portfolio.
Who was the smartest man in the world in history
Sir Isaac Newton holds the title of one of the smartest men in the world in history. Albert Einstein himself declared that Newton was "the smartest person who ever lived and the greatest scientific mind of all time". This assessment from one of physics' greatest minds carries the most important weight.
Newton's estimated IQ places him at the pinnacle of human intellect. Psychologist Catharine Cox's 1926 study estimated his IQ at 190, within a range of 190 to 200 that only a handful of people in recorded history have reached. To provide context, Einstein's estimated IQ was 160.
His achievements justify these estimates. Between ages 23 and 26, Newton invented calculus and developed the laws of motion and universal gravitation. He also advanced theories on optics. During the plague years of 1665-1666, he produced what physicist Louis Trenchard More called "the richest and most productive period ever experienced by a scientist".
Newton published Philosophiae Naturalis Principia Mathematica in 1687. This work unified physics and established classical mechanics that dominated scientific thinking for centuries. He built the first reflecting telescope and developed colour theory. At just 26 years old, he served as Lucasian Professor of Mathematics at Cambridge.
Carl Friedrich Gauss, one of mathematics' greatest minds, used the word "summus" (supreme) for Newton alone.
The South Sea Company investment disaster
Newton invested in the South Sea Company in 1720. Founded in 1711, the venture traded with Spanish South American colonies and engaged in the slave trade. The company's stock experienced one of history's most legendary financial bubbles.
Newton showed original wisdom. Earlier in the year, he sold his South Sea shares and pocketed 100% profit, totalling $9,500. He acknowledged that the market was becoming increasingly unstable.
However, as share prices soared from $175 in January to over $1,400 by August, Newton changed his mind. Swept up in the market frenzy, he jumped back in at a much higher price. This decision proved catastrophic.
The bubble burst in September. Share prices plummeted to $240 and collapsed further to $170 by December. Newton lost $27,000, equivalent to more than €2.86 million in current value. Some estimates place his losses closer to €3.82 million.
His net worth had fallen to about $27,000 by mid-1721. He had lost all his early profits and much more besides. For that reason, Newton forbade anyone to speak the words "South Sea" in his presence for the rest of his life.
While surveying his losses, he remarked that he could "calculate the motions of the heavenly bodies but not the madness of the people".
Why intelligence doesn't prevent investment mistakes
What you need is the temperament to control the urges that lead other people into trouble when investing. His business partner Charlie Munger reinforced this view and noted that "many people with high IQs are terrible investors because they've got awful temperaments."
Research supports their observations. Dr Daniel Goleman's work on emotional intelligence found that IQ contributes only 20 percent to the factors that determine life success. The remaining 80 percent stems from other forces, especially emotional intelligence and self-control.
Overconfidence proves dangerous for intelligent investors. Many assume their intellect provides them an edge and overestimate their abilities while underestimating risks. Highly educated professionals often make poor investment decisions not from lack of knowledge but from confirmation bias. They seek information that supports pre-existing beliefs and ignore contradictory evidence.
Loss aversion affects all investors. Research demonstrates that losing €100 feels twice as painful as gaining the same amount feels positive. This emotional response drives irrational decisions whatever the intellectual capacity.
Herd mentality creates powerful social pressure. Share prices rise and investors copy each other's behaviour. They buy at inflated prices. Ben Graham taught that "individuals who cannot master their emotions are ill-suited to profit from the investment process".
Final Thoughts
Newton's story demonstrates that intelligence alone won't protect your portfolio from devastating losses. His $27,000 loss in the South Sea bubble proves that emotional control matters more than IQ when investing.
Overconfidence and herd mentality affect brilliant minds as severely as anyone else. Ask yourself whether you're following sound analysis or getting swept up in market excitement before making your next investment decision, just as Newton did three centuries ago.