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by iav 1257 days ago
They don't. Remember that NASDAQ's clients are Jane Street, Goldman Sachs, i.e. not you or me. They don't onboard a client with doing due diligence. Then there is a clearing and settlement system called DTCC that requires every firm to post collateral equal to their trading volume. This system's primary job is to make sure everyone has enough funds to pay for their trades across all exchanges, not just NASDAQ.