Quote from cigarno:
What is irrelevant??!! This is the WHOLE point.........!!
Arbitrage, do I need to remind you, is taking advantage of price difference of the same product in two different markets in order to make a profit.........Now back to your example, buy the euro for 1.2001$ then what?! where do you sell the euro for more than 1.2001$ to profit?! Remember FX futures contracts are settled daily at volume-weighted average price traded at CME....... so you can not sell the euros there..........No what to do with your euro?! Arbitrage, eh
In the example I gave earlier, the only thing a trader would need to do to arbitrage the difference would be to simultaneously buy at 1.2001 on Broker ABC and sell an equivalent amount at 1.2020 on Globex. You really don't care if EUR/USD goes up or down as you're delta neutral. At some point, the gap between the two will have to disappear since the quote at Broker ABC will go up and/or the quote on Globex will go down.
Since you think that OTC forex brokers can quote anything they want, can you give me an example and evidence of a broker whose quotes are different than those on Globex when accounting for spreads and commissions?