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...Minimum obligations of market makers economic impact assessment eia foresight government office for science contents objective background risk options cost risks and benefits future summary recommendation references daniel weaver this review has been commissioned as part the uk s project computer trading in financial markets views expressed do not represent policy any or organisation business model is to buy securities from sellers then resell them at a higher price buyers can be officially recognized such operate that capacity on de facto basis latter case many high frequency firms without are free enter exit will set sell prices level measure examine efficacy imposing these take form maximum spread width quoted volume location relative best bid offer percentage day maker must quote time force quotes we discuss context equity attempt identify whether should applied universally specific stocks welfare implications examined individual well society what she much different than grocer exc...