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    bad advice on NOT paying the spread?

    I've done a lot of reading online, and some advice I've seen repeated says that we can avoid paying the spread by placing limit buy orders on the BID, and limit sell orders on the ASK. Advice goes on to say the only downside of this strategy is that you might not get positions filled. My logic...
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    exchange member vs "direct access"

    Ah, I knew it was heavily regulated but didn't realize the costs necessary were in the 5mm range. Yes, I'll be sticking with IB. Thanks for replying.
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    exchange member vs "direct access"

    Still new to trading, have read a lot, but still can't figure out what might be a basic question to you all: Why can't individual traders gain membership to exchanges? Why to gain "direct access" do we need to go through a broker (who charges commissions, and in the case of adding liquidity...
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    Hidden orders?

    Great article, Daal. Thanks for posting. One thing that article mentioned was casting a "hidden order net". Do you or anyone have experience doing this? For example, if I wanted to buy 100 shares I guess I could route to two exchanges and then cancel the one that doesn't get hit. But lets...
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    Hidden orders?

    Thanks, Bob. That makes sense and is important to know. I guess I was under the wrong impression believing that mid-point peg orders would be the most likely to fill without taking liquidity, but since those are hidden, I guess that's not the case. Do you have a recommendation as to the...
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    Hidden orders?

    Can hidden orders be hit across different exchanges? For example, if I place a hidden order on EDGX, and someone places a market order ARCA, could my hidden EDGX order get filled? Or are hidden orders "hidden" to all other exchanges?
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    historical data sets with delayed price changes?

    I've noticed from my data set that when looking back at old data from mid-2000's, a few stocks often won't have any trade volume for early minutes, and then 4-5 minutes into the trading day have their initial spike (~25,000). Example below: Time: volume 9:30: 0 9:31: 0 9:32: 0 9:33: 0 9:34...
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