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Adding support for fast settlement doesn't necessarily mean removing support for slow settlement. The customer placing an order could simply mark trades as "fast" or "slow".



...And then we would need arbitrageurs to keep the fast NBBO in line with the slow NBBO, so that people in the two pools can trade with each another.


Why? This only affects settlement, not execution. Execution is already "real time".


Because the trade has two sides that have to agree on settlement terms.




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