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> Other broker-dealers restricted trading due to capacity issues. For example, one firm’s system created a unique ID for each order, but purportedly reached a limit in the number o…

Ah this is a great question! The answer mostly boils down to a policy decision to maximize safety of the overall system. You can imagine a situation where a malicious actor (not ne…

Because they can't use customer funds for these collateral requirements. Note though that the collateral requirements only apply to firm-wide net buys. So if you're buying $100 of …