After reading quite a few posts I have a question about the nuts and bolts of spot trading...perhaps trading in general. Let say I buy 10 lots of EUR/USD @ 1.3043 with the sell price at 1.3040. If I was watching the tick chart, what would the effect of this be? Is every tick up equal to a certain amount of lots? Also I know that buyers drive and market up and sellers throw it down, but how does it really work? In the previous example does the sell price of 1.3040 become 1.3043 and the buy price become 1.3046? If so, if there was no resistance would this three pip gain equal someone buying 3 lots? Some clarity on this would be great.
You have hit on one of the key questions that needs to be understood consciously or unconsciously when trying to understand why markets with marketmaking features , i.e quotes available for bid and ask prices, move as they do.
The best theoretical explanation I have seen is given in Palgrave's Dictionary of Finance. Different markets will be moved to greater or lesser extent by different lot sizes, and when marketmakers try to second guess the market, they may diverge from theoretical expectations for periods of time.
There are various sites on the web which show the separate trades reported with prices agreed at each trade, and you can get a feel for how reality often diverges from theory in this sort of data.