medium · Market Microstructure spread-econ
A buyer purchases 1,000 shares of XYZ at 30.08 when the National Best Bid and Offer (NBBO) is 30.04 bid and 30.08 offer. Five minutes after the trade, the midpoint has shifted to 30.10.
What is the realized spread for this transaction, and what does it indicate about the dealer's outcome?
- 0.02; the dealer achieved positive alpha against the market move.
- 0.04; the dealer earned a profit equal to the effective spread.
- -0.04; the dealer suffered a loss due to adverse selection.
- -0.08; the dealer lost the entire width of the quoted spread.
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