Frameguy's information is obviously wrong.

The highest volume is EUR/USD, followed distantly by GBP/USD, USD/CHF and UCD/JPY.

This is the reason why it is called the 4 Majors. Eurodollar does about 2x the volume of the other majors.

Why do you think the spread is 2 pips on the Euro? Volume/liquidity.

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