En-ROADS does not represent circular economy supply chains at this time. En-ROADS is a global simulator, so it encompasses all the material flows in our supply chains that release emissions. However, it is not designed to look at the granular levels of specific manufacturing supply chains. Users interested in strengthening the circular economy might consider adjusting the energy efficiency sliders to account for improvements that would reduce energy demand. You might also find these other FAQs helpful: 

How do I simulate recycling or reducing plastic? 

How do I simulate reducing waste or inefficiency?