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> Nowadays the stock exchanges have a fair setup where ... everyone gets to connect with an equal length wire

"Everyone" is pretty questionable here - it's quite expensive to rent rack space in an exchange, and not everyone gets to do it. That said, I think basically anyone who has any business doing latency-sensitive trading is probably capable of getting a rack.

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The prices are minimal -- at CME I believe it's ~15k/month for a 52U cabinet. You can rent these even as a private individual (several friends have rented individual racks as part of a syndicate group renting the whole cab).

Of course, that price isn't insignificant per se, but are minimal for anyone who actually achieves any benefit from having co-located space.

Hmm, my former firm’s colo expenses were quite a bit higher than that would suggest, but I don’t know the breakdown across all the different datacenters.

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