Quote from skippy:
Thanks for this beautiful, lucid explanation. I do have one question, though.
You write, "when a big 500 contract bid shows up 3 ticks below the current price on an ACV, it is a 500 contract SELLER than is pushing the price down to meet that offer". But wouldn't such a hypothetical order represent a standing BUY order? After all, if this individual has a standing bid three ticks below the market, isn't s/he, in effect, your proverbial supermarket purchaser saying, "i'll buy 1000 crates of grapes for three ticks below the last transaction price?"
This would explain why markets often "run to size". Here's a guy offering to buy 1000 contracts. Someone/someones are gonna want to do business with him. So, do I have it right here? Or am I missing something?
Thanks again..
Skippy, your thinking in the right direction, but let me try to fill out the picture for you. When a potential 500 lot buyer shows up 3 ticks below the current price, he is saying
"I'm a big swinging dick, and if you guys want me to make a HUGE sale, you need to come down to me."
Now, if you have 500 lots to sell, and you want to get out, you will likely need to meet his price. So, it is this SELLER that is, in effect, pushing the price down with every sell order he puts through, until it drops 3 ticks to meet the "big swinging dicks" buy order.
Mind you, this probably isn't the sellers favorite thing to do. I mean, he wants to sell as high as possible...but in a weakening market this may be the best chance he can get before the market drops lower.
In other words, big sellers and buyers have to find each other to make big exchanges. Small sellers and buyers can fill in the gaps wherever they want. The one who has the luxury of waiting on the bid/ask, rather than needing to get out/in right away, is the one that the price will go to.
So, when the DOM shows a big bid or offer hit...it is an rather larger seller/buyer that is selling/buying until they can match the price there.
And again, this is because they can't get out just anywhere, because they have more to sell/buy at any given moment than the market can usually absorb.
Just a theory anyway... but it seems to gel in my mind in regards to several accepted concepts:
1. Big players move markets...the rest of us work around them. Pretty commonly accepted knowledge
2. Basic supply/demand laws. You hit the offer with a boatload of contracts...price will be pushed down, unless there is equal demand to buy. Hard to refute this.
3. Price DOES indeed move to size, and this is the only logical explanation I've found for this phenomenon.
Sorry for the incredibly long winded answers...trying to be as complete as possible, hope this helps.
Greg