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Also discussed open issues against the options ontology, and in particular, the nature of a market maker, and of a central counterparty for options. See https://www.stockinvestor.com/36141/market-makers-options/, and also https://www.youtube.com/watch?v=GH_gN4hYIRk&t=21s. The question is whether we really want to retain the concepts of buyer / seller, or whether we want to ignore that distinction and deal with holder / issuer and market maker vs. broker, etc. Brokers deal directly with clients, whereas market makers are large firms that are members of an exchange. Also, see https://blog.quantinsti.com/market-making/ which has a much better summary of the distinctions between a market maker and a broker.