It's irrational.
It goes up and down without close correlations to what's going on in the world.
There's a lot of money to be made if you can predict the fluctuations or make it go up and down.
The valuation of a company, the valuation of a piece of real estate. How is that so irrational? Aren’t there general yardsticks of fundamental value that a person or an investor can use to intelligently determine what is a reasonable fair market value? How is that gambling?
It’s not gambling....at all.
investing is neither irrational nor gambling. Trading on the other hand is.