where do fx prices originate ?

i admit to naive ignorance about the answer to this question - ahh bliss


for instance closed H - L prices on fri nov 13/09:

MT4: . . . . . 1.4936 - 1.4824
Oanda: . . . 1.4939 - 1.4825
Globex 6E: 1.4937 - 1.4823

there's a variance between the price movement of the 6E and eurusd - mt4 - and either
one can lead the other, but the 6E has the tendancy to go a pip or two H / L at the end
of a wave, also mt4 and Oanada quotes tend to be 2 pips above the 6E

who's setting the price ? at least at the 'start of the day'
i only recall one large down opening on the Sunday after Saddam was captured - opened
down 100+ pips, who decided that ?
 
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