Again, this complex network should really be just called "The Economy". But this (wonderfully) tangled network evolved from something which used to be much simpler. Friedman famously waxed lyrical about the pencil supply chain at mid-century, which was complex but nothing like what see today

Now imagine tracing the evolution of this system from, say, 1500, when most (but certainly not all) output was still produced from inputs which were national or even very local. Then more and more goods get globalised in their supply chains in the century before the Industrial Revolution.