Hard Market Microstructure Practice Questions

75 free hard-difficulty Market Microstructure questions, drawn live from KomFi's calibrated bank. These are the items that separate top scorers — every one carries a full explanation and trap analysis once you sign in.

1. If the probability of an informed trader is α = 0.2, what is the competitive ask price a dealer should set?
2. What is the Probability of Informed Trading (PIN)?
3. If the probability of informed trading α is 0.3, what is the equilibrium ask price set by a risk-neutral deale
4. If Σ₀ = 0.25 and σ_u = 5,000, what is the resulting price change Δ P?
5. If α = 0.5, V_H = 60, V_L = 40, and the prior is δ = 0.5, calculate the mid-price after a buy order is execute
6. In the equilibrium of the single-period Kyle model, how much of the informed trader's private information is r
7. What is the break-even quoted bid-ask spread the dealer must set to cover adverse selection costs?
8. A Glosten-Milgrom model has V_H = 200, V_L = 150, δ = 0.3, and α = 0.5. Calculate the probability of a buy ord
9. Which of the following legal strategies is most likely to be employed by this trader?
10. A retail broker receives PFOF of $0.20 per 100 shares. If they route a 500 share market buy order to a wholesa
11. A stock is added to a major index. If the event probability α increases from 0.2 to 0.4 due to higher informed
12. In a Glosten-Milgrom framework, if the prior probability of high value V_H is 0.5, and the probability of an i
13. Calculate the Probability of Informed Trading (PIN) given the following daily parameters: probability of an in
14. VPIN (Volume-synchronized Probability of Informed Trading) is computed as the average absolute imbalance betwe
15. A dealer quotes a bid-ask spread using the Glosten-Milgrom f… — Holding μ fixed, how does this asymmetry chang
16. Which conclusion about the implied price impact of an unexpected buy order is correct?
17. Under the standard assumption that informed traders strongly prefer immediate execution while uninformed liqui
18. A trader wants to buy 5,000 shares cheaply. They place a lar… — What pathology is this?
19. A trader observes the following order book for 'Zeta': Bid: 100 @ 10.00, 200 @9.95 Ask: 100 @ 10.05, 300 @10.1
20. Approximately how long does the SIP-informed slower router remain exposed to the stale quote, and what trade d
21. What is the maximum time window during which the market maker on B has not yet received the signal to update b
22. An ETF's intraday indicative value (iNAV) is calculated by t… — Which participants exploit this deviation and
23. What is the stale-quote window during which the HFT can trade against the slow participant's quotes, and what
24. Which microstructural metric combination most definitively identifies this as a 'spoofing' footprint rather th
25. Under strict price-time priority, what determines how many firms fill and what share of those 500 shares each
26. If the typical aggressor size is 4,000 shares, which matching engine provides a higher probability of an immed
27. If a market buy order for 1,000 shares is submitted, what is the exact difference in the allocation received b
28. What is the clearing price that maximizes traded volume?
29. If a market uses a Pro-Rata matching engine rather than Price-Time Priority (FIFO), how might the permanent im
30. What is the clearing price that maximizes the traded volume?

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