Personally, I think we should charge as much as the market can bear. However, it's a difficult number to determine, I think. Looking at the Social Cost of Carbon (EPA) table, I would go with the most expensive figure they determined per year. In 2015, it was $120. However, I think maybe we could get prices to regulate them themselves. Australia has created a national water market (http://www.nationalwatermarket.gov.au/) which acts as a water stock. “Having a market that everyone has access to, no matter how much money or how much land they have, means that there is a balance that naturally occurs within the market” (Peterson 2015). I think this could be adapted. Ask the government to set the allocated carbon use each year. Then, each year, some people could sell their carbon stocks back to the government, reducing the overall stock available. Also allowing companies to continue to trade carbon stocks with each other. Alternatively, prices could perhaps be set in the form of auctions. Every year the government says we have x amount of carbon, it will be auctioned in blocks and starts the auction. This would also have the added benefit of creating more money for the government, which could then be reinvested in other