Uncommon Common Sense Considerations to Keep in Mind When Investing

Allan RothThe views presented here do not necessarily represent those of Advisor Perspectives.

When it comes to investing, I’ve learned that common sense isn’t all that common. In fact, I’ve seen brilliant people lose millions of dollars on investments without using one ounce of common sense. They have acted purely on emotion.

Here are a few examples as well as some simple ways of deploying logic when faced with statements meant to make you react in an emotional way:

1. Bitcoin price will grow by 30% a year for the next 20 years. This forecast came from someone who has made a fortune for himself and others with bitcoin — Michael Saylor is the CEO of Micro Strategy, now called Strategy Incorporated. He recently said bitcoin will grow at 30% per year for the next 20 years. He has grown his company’s stock by 3,250% over the past five years to a value of over $110 billion. If Saylor is right, one bitcoin worth $108,127 as of July 7, 2025 will be worth more than $20.5 million in two decades. Why not? A decade ago, it traded at just over $266, which equates to just over an 82% annual growth rate. Saylor is actually predicting a much slower growth rate over the next two decades than the last decade.

As smart and compelling as Saylor and his logic sound, it has about a zero percent probability of happening. Today, the value of all outstanding bitcoin is about $2.15 trillion. That’s a big number. And it makes bitcoin more valuable than all but five U.S. companies — Nvidia, Microsoft, Apple, Amazon, and Alphabet. But if you take something that valuable and grow it at 30% annually for 20 years, it becomes worth $408.6 trillion. That’s roughly 6.4 times the size of the U.S. stock market and 3.3 times the size of the global stock market.

Even if stocks returned 10% annually (8% growth and 2% dividend yield), bitcoin would be worth more than the U.S. stock market and nearly as much as the global stock market. Since the stock market represents the future cash flows of global capitalism, Saylor is essentially predicting that one crypto coin (out of thousands) will be worth as much as global capitalism. Impossible? Maybe not, but I’d bet my future on winning the lottery before I’d bet on 30% annualized growth for the next two decades.