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Which is the most liquid market for trading?
Depends on how you measure liquidity.  There's papers out there that approach this very question. Measured in order book spreads for a consolidated $100m trade, I'd say the second biggest market is FX swaps, followed or par'd by the money market (government bonds). If you disallow OTC venues, it's most definitely exchange listed government bonds. If, however, you happen to think in terms of sheer volume per time, the most liquid market phase could be considered the NYSE closing auction, as you can move billions in a matter of minutes, or expressed in speed terms: several m$/s (million dollars per second). You should pick a definition and we can provide you with a more accurate list of candidates and actual data.