I think here we are correlating the size of the input and output here with the size of the machine in the middle that creates it. It's kind of like saying "Why

I think here we are correlating the size of the input and output here with the size of the machine in the middle that creates it. It's kind of like saying "Why would the factory creating tiny processors for phones (with only tiny bits of raw materials) need to be larger than that other factory that produces loads of big loafs of bread?"