Just came up with a new idea, but i dont know how to make a diagram for it.

So, Organizations demand resources:

[Organization]-----<demand>------[Resoruces]

Resources has attributes like ResourceID, ResourcePrice, ResourceName.

So at this point i have two entitys. I need two more. so my idea was that Resources would divide into two parts, Servers and Computers, like two separate entitys.

http://prntscr.com/7cq8uk

But i have no idea what kind of relation would it be.

So heres my Idea of how that ER model should look. Not sure if its correct or not. Its just draft or something. Anyways, like this i am reaching four entitys. But, is my ER model correct? And is it even possible to do something like that?