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Answer:
Go demo on ECN brokers and you can see level 2 market depth. On MBT, I see 1 million units (10 lots) of EURUSD (most liquid pair) get traded at least every second on average, and I've seen orders as big as 5 or 6 million units get filled as well. FX is huge and super liquid.
That's just MBT. Imagine how big the institutions trade with each other everyday.
The 8 majors are the most liquid, so I would stick to those if you trade frequently.
