# Tag Info

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The "price protection" refers to RegNMS in the US. A stock exchange that does not have the best price must route all order flow to the exchange that does. The SIP in the figure is a consolidated feed that lists the best price among all exchanges. Consider this example: a broker sends a market order to buy JNJ to NYSE where the best offer is \$86.97. ... 6 Approaches like FIFO and LIFO are most useful for tax accounting. If you don't have a tax accounting reason to do them, I'd recommend avoiding them, as they don't reflect actual realized gains (it's very rare for a position accounting system to move cash in and out of your account based on FIFO or LIFO). I'm going to discuss everything here in Gross of ... 4 I'll add my own experience here based on what we do at our firm, simply to provide more support for what Brian said in his answer. Fills that move a position further away from 0 contribute to the average price of the position. Fills that move a position closer to 0 "book profits" against the average price of the position to that point in time. Any fill ... 3 If I understand correctly the TCP roundtrip time can be used as a posteriori proxi for the order entry gateway delay. So assuming the roundtrip time is composed of gate delay and independent other delays$RTT_g(t) = dT_g(t) + d_g(t)$with assumed$Cov(dT_g,d_g)=0$and$Cov(d_i,d_j)=0\$. Minimizing the this combination of gate delay and other delays is ...

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Optimal value of n should be calculated based on how much amount you want to invest in that decision, that can be for example 200 000 of base currency, and minimum order size is 10 000 of base currency then you should have 200 000 / 10 000 = 20 orders in my opinion that are targeted at hotspots where is most single price points inside interval. EDIT: When ...

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Yes. You're right that queue position is less important in a pure pro-rata market. But in a market that is very deep, such as Eurodollars, the cost of getting adversely selected ("catching a falling dagger") is huge (very large bid/ask spread). So it is critical to cancel any open orders quickly when the price is about to move.

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