hard · Volume Profile Analysis

In the context of the Glosten-Milgrom model, if the proportion of informed traders (π) in the market increases, what is the theoretical effect on the bid-ask spread set by a risk-neutral market maker?

  1. The spread narrows to attract more uninformed 'noise' traders.
  2. The spread narrows because informed traders provide liquidity.
  3. The spread widens to compensate for increased adverse selection risk.
  4. The spread remains constant as long as the market maker is risk-neutral.

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