Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Do you know of any online monetary systems?
I'm not sure, but I think the monetary system of Second Life or World of Warcraft would correspond to what you are looking for. I don't think they are independent of the dollar though, since acquiring liquidity in those games can be done through exchange for real dollars. But there can be more closed systems, maybe Sim type games where this is not the case. I hope this helps.