[eulenteufel]

That's hard for me to understand. I'd take 'crucial to the enconomy' to mean 'positively coupled to the rest of the economy' or 'the rest of the economy would be worse off/less efficient if this financial instrument were to be outlawed.

Why does this follow from 'makes a lot of money'? That seems like a very complicated question to me.

[jakupovic]

I was trying to say that these are equivalent, crucial to economy and way to make money. To me they are equivalent because capitalism will find the shortest and most efficient path, if it doesn't make money it will not exist. Hence, crucial means survives by making money.

[rrrrrrrrrrrryan]

Most relationships in capitalism are symbiotic, yes, but just like the natural world, predatory and even parasitic relationships abound as well.