Imagine right now that the market is open. I can place a buy or sell limit order right there in the middle, and that may very well get filled. Hell, I have been many times in the past. If it does, it means that some buyer (if I'm selling), or some seller (if I'm buying,) looking at the current bid/ask spread, decided my price was more attractive than the current bid or offer 5 ticks above or below my current bid/offer. If they trade me, they will have effectively moved the ladder to that last price. It is then up to the other people on the ladder to decide if that I the place THEY should also be pricing, and the market mechanics take off from there. It just happens a lot more quickly than a bunch of farmers in a farmer's market with fruit tables.
Perfect example, I do like it, so here comes a question I asked before without getting any clear answer: couldn't this be used to try start a trend? Could I agree to buy or sell with a buddy on the other side at a higher or lower price and go on for sometime at this game to try induce others to jump in and fuel the trend in the direction I want?
nt