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Non-fungible tokens (NFTs) arose as a medium of exchange without an economy. Virtual worlds create a virtual microcosm of the real economy. Visitors can irrefutably prove ownership of the digital assets they buy, sell, and trade. Game developers and gamers will benefit from economies of scale and network effects — as more people have access to gaming assets, NFT value will increase. The MMOG/MMORPG markets are the first to exchange NFT assets across different virtual worlds.