I came across this excerpt interview of Mark Cuban with Young Money Magazine:

YM: Do you have any general saving and investing advice for young people?

CUBAN: Put it in the bank. The idiots that tell you to put your money in the market because eventually it will go up need to tell you that because they are trying to sell you something. The stock market is probably the worst investment vehicle out there. If you won’t put your money in the bank, NEVER put your money in something where you don’t have an information advantage. Why invest your money in something because a broker told you to? If the broker had a clue, he/she wouldn’t be a broker, they would be on a beach somewhere.

Although I admire Mark Cuban in many ways, I disagree completely with his statement.  Simple math will show that money put in the bank will at best just keep up with inflation (the interest rate = inflation) and at worst erode the value of your money (inflation is greater than interest rate).  Money in the bank will never grow, which means the only way to grow your money is to put more into it, i.e. have a salary.  Do you really want to be working and earning a salary in your 70s and beyond?

Money in the bank only works for two kinds of uses:

  1. You need the money in the near future (in the next three years) and don’t mind the risk of value erosion from inflation for a limited amount of time.
  2. You have so much money you can buy a couple of Ferrari’s every month from just the interest you get from the money in the bank.

I think Mark Cuban falls into the second category, so while his advice may work for him, it won’t work for the majority of us.

On the other hand, I do agree with him that one should never put one’s money in something where you don’t have an information advantage.  But the information advantage need not be secret — just do your due diligence and crunch some numbers using the 10K and 10Q reports put out by the companies of your interest.  You may ask, “If the information is so readily available, how is it advantage?”  The answer is, most people don’t bother crunching the numbers.  When you do, you have the information most people don’t and thus have the advantage over the majority of the people.