Keeping the order book gives the specialist more information than the other market participants, and thus gives him an advantage. From the point of view of the other participants, the advantage of having a specialist in place is that there is always guaranteed liquidity.
Spe"cial*ist (?), n.
One who devotes himself to some specialty; as, a medical specialist, one who devotes himself to diseases of particular parts of the body, as the eye, the ear, the nerves, etc.
© Webster 1913.
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