Originally posted by vulture
IMO, your focus on the depth of the market appears to be inconsistent with your overall reliance on "raw price action". After all, how reliable is the depth of the market when a large majority of the bids and offers on the mini are simply arbitrageurs trying to hit the bids and offers electronically against a position in the full contract in the pit...How often is the depth of the market simply the result of one of the many program trades that hits the market as some statistics suggest better than 50% of the day...
Vulture:
Thanks for the reply.
I believe that I stated in my post that I'm not sure that is "says anything".
I actually watch the market depth for a variety of reasons. One of those is that it's a handy little box that I can bring up on my screen in the corner that serves as a check on the timeliness and accuracy of my quotation system. I can see the price from 2 sources at the same time.
But I doubt I ever said I rely on "raw price action". I try to give myself lots of different information, the idea of which is that one of these various items might give me a clue with which to trade...an edge as some of you guys put it.
You know Vulture, I'm really glad you brought this subject up, because I think it goes to illustrate a point:
I like to watch the news for example. But as with most things in the market, I don't watch the news for the news itself. I watch the news to see how the market reacts, or sometimes more importantly, how it does NOT react. For instance, on the 11th I think it was when the Michigan sentiment came in much worse than expected. Now this is a news item that the market pays attention to, and that the market has sold off on numerous times on the way down. But this particular day, it sold off for maybe 1 minute, then straight up to new highs. It shrugged it off. A bullish response I'd say...and that bullishness continued last week, shrugging off nearly every negative economic indicator. Important information to know, that you wouldn't know if you only watched price action.
Now back to the market depth. You say this reflects arbs. I don't know if that's true exactly. For instance, all of my orders are limit orders, so they all show in market depth. I'm sure there must be others that use limit orders as well.....BUT, let's say you're right....it's mostly arbs. (By the way, speaking of arbs, I suspect that there is significant arbitrage between the NQ and the ES, not just between the big contract and the ES, something to keep in the back of your mind because it will influence moves from time to time as well.)
I think I mentioned that at one time I was on the floor. There were several locals that primarily arbitraged between two different floors. One large local had hired a clerk to stand behind the pit, with an open line to the other floor, and chanted the prices to him throughout the day as he bought and sold our pit. This guy was a large trader. Now let's say that us directional types are all bullish, so we buying everything in sight. Suddenly here's this guy a huge seller, he can soak up everything we want to buy. Think that's important knowledge? He's an arb, but if he has a place to lay off our action....that sure puts a damper on things doesn't it. I call that a resistance area.
Friday, as we bounced off the lows in the ES, it was really amazing to see solid sellers on the market depth. Size on the sell side dwarfed the buy side. Yet, we were moving effortlessly through that size. Does that mean anything? You say it's all arbs on both sides. And yet the heavy side of the quote is being taken out effortlessly. To me, that means something.
And so that brings me to WHY I watch things. I watch when I think they have the potential to give me a perspective, a clue as to how I should be viewing the market. Sometimes they say nothing...and that's OK with me because I watch lots of things for that exact reason. I would put the market depth thing in that type of slot. Most of the time I'm not exactly sure what it's saying. Sometimes I think it's because I'm not smart enough to have figured it out yet. But regardless, I keep watching because it serves as a check on my quotes, and it "might" tell me something at some point.
Coming back to the floor for a moment, you know, one of the advantages of being on the floor is you see what's being done around you...you hear it, you see who's doing it, you see how much. I'd say that's an advantage at times for those who understand it. As screen traders we lose that type of feel. But to me the market depth gives me perhaps a tiny bit of that back.
And now, I use it one other way that has definitely put some money in my pocket. I use it to help me with order placement. Let's say I want to buy something....but there's size over on the offered side of the quote. That means I can buy on the bid in all likelihood, because someone is going to come in and step ahead of the large offer. If I can successfully buy at the bid, then in my mind that puts an extra $12.50 per contract in my pocket. It's a very small edge, but again, I think that's definitely worthwhile, at least that's my perception of it.
Again, like most things, it's not a tool that has categorical rules. It's something that you look at in the context of everything else that you're looking at in the market. I don't look at anything in isolation.
And finally, I think the way I put this at one time is that I viewed myself as a detective, looking for clues as to possible direction. I never know where the clue is coming from, or what information will gel in my mind. I just know that if I watch and wait long enough, something will come up.
Hope that sheds some light.
OldTrader