[x]

It's gambling.

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.

[Professional]

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?

[Osage Orange]

It’s not gambling....at all.

[bigdaddy45]

investing is neither irrational nor gambling. Trading on the other hand is.