When trading penny stocks one can easily experience this effect, you buy a huge volume and it raises the price and everyone else starts buying then you stop and start selling and price plummets (usually losing you money)...
I was thinking about the actual FX market, there should be a certain volume that makes you big enough for the market to start reacting at you (I am guessing it is probably related if not based on total volume traded in that timespan).
EDIT: I understand that the spread is bigger and the volume is smaller for some currencies (EURPLN) than for major pair like (EURUSD) however, what I am asking is what sort of volume one needs to trade so that market would start reacting.
So the example answer I would expect to be: 0.5-1% of the volume traded in that timespan (could be 1 minute or 5 sec or whatever)...
I am indeed assuming that there is such a relationship between total volume and size of the trade, but it only seems logical to me...
What is the volume of total volume traded in that timespan one needs to trade for the market to start reacting?