The best example of a derivative is an option. Why should an option be illegal? What part of society do you want to see benefit?
If you buy a share is that beneficial to society?
If you pay for an option to buy that share is that beneficial?
Not sure what you are driving at. We do live in a capitalist society after all!
I heard a lot about this but I'd like to know if it even has a beneficial function on the rest of society.
