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How does the exchange charge for access? Per trade, per bandwidth, per colo distance?

It would be simple for the exchanges to reign in trading by adjusting their pricing model. Make it more expensive to make each type of request. Adding a few cents to the request would squash HFT while not drastically effecting other trading systems/people.



All of the above, actually.

The exchanges have a per-trade charge, and for the data, they charge fees on a per data stream basis, and charge for colocation.

And they already do make each tier more expensive than the previous.


Here's Nasdaq's price list: http://www.nasdaqtrader.com/trader.aspx?id=pricelisttrading2


>Each 56kb line with single hub and router (for remote disaster recovery sites only)

Mm good old days of dialup. All yours for $900/month.




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