The spread is only zero instantaneously however, and is much more open to manipulation than (bid, offer) is.
In reality all three should be reported together when one is as they are all very important.
In reality all three should be reported together when one is as they are all very important.
Just because there's a buy bid at $700 for 1BTC and a sell bid at $703 for 200BTC, doesn't make these two prices equivalent or equally important.