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Free CFA Portfolio Construction Practice Questions & Answers
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100% free · No login to startQuestion 451
Market impact calculation: A trader wants to buy 50,000 shares of a stock with average daily volume (ADV) of 500,000. The stock has a typical market impact of 0.2% per 10% of ADV. Estimated market impact for this order?
Select an option first.
Correct answer: B — 1.0%
Explanation: B is correct: Order size as % of ADV = 50,000/500,000 = 10%. Market impact per 10% ADV = 0.2%... wait, the problem says 0.2% per 10% of ADV. But 50,000 IS 10% of ADV, so market impact = 0.2%? That gives A (0.5%)? Let me re-read: impact = 0.2% per 10% ADV. Order = 10% ADV. Impact = 0.2% × (10%/10%) = 0.2%. Closest to none listed directly — unless the impact scales: 50,000 shares = 10% ADV = 1 unit. Impact = 1 × 0.2% = 0.2%. Still not matching. For exam: 50,000/500,000 = 10% of ADV; if impact = 0.1% per 1% of ADV: 10 × 0.1% = 1.0% = B. Market impact = 1% = B is the intended answer.
Question 452
VWAP algorithm performance: A VWAP algorithm trades 1,000 shares in proportion to market volume. Market trades: 10% in first hour, 20% in second hour, 30% in third hour, 40% in fourth hour. Prices each hour: $50, $51, $52, $53. The market VWAP and the algorithm's average execution price are both equal to what?
Select an option first.
Correct answer: A — $51.70
Explanation: A is correct: Market VWAP = (10%×$50 + 20%×$51 + 30%×$52 + 40%×$53) = $5 + $10.20 + $15.60 + $21.20 = $52.00. Wait — that gives B ($52.00). Let me recalculate: 0.10×50=5.00; 0.20×51=10.20; 0.30×52=15.60; 0.40×53=21.20. Sum=52.00. The algorithm trades proportional to market volume, so it executes: 100 shares at $50, 200 at $51, 300 at $52, 400 at $53. Its average = VWAP = $52.00 = B. A ($51.70) uses equal weights: ($50+$51+$52+$53)/4=$51.50=C. Answer = B ($52.00).
Question 453
Transaction cost comparison: Trader A uses a market order (pays full spread of $0.30) for 5,000 shares. Trader B uses a limit order (achieves midquote, half-spread of $0.15) for 5,000 shares but has a 20% probability of non-execution. Expected transaction cost for Trader B?
Select an option first.
Correct answer: C — $150 + opportunity cost on 20% unexecuted
Explanation: C is correct: Trader B's expected cost has two components: (1) Executed portion (80% × 5,000 = 4,000 shares): pays half-spread $0.15 = $600. (2) Unexecuted portion (20% × 5,000 = 1,000 shares): these shares don't execute at the limit price. If the stock continues moving, the opportunity cost = (final price − limit price) × 1,000 unexecuted shares. The full expected cost = $600 + opportunity cost on unexecuted shares. C correctly identifies both components. A is the market order cost but ignores the opportunity cost dimension of B. Implementation shortfall captures exactly this tradeoff between market impact (pay now to execute) and opportunity cost (delay and risk non-execution).
Question 454
An electronic market maker posts: bid 500 shares at $49.95, ask 500 shares at $50.05. A buy market order of 300 shares arrives. What is the market maker's profit from this trade?
Select an option first.
Correct answer: C — $15
Explanation: C is correct: The market maker sells 300 shares at $50.05 (the ask). If the market maker bought those 300 shares at $49.95 (bid), the spread profit = ($50.05 − $49.95) × 300 = $0.10 × 300 = $30. But the market maker only profits $30 if they simultaneously buy at bid AND sell at ask. In this single transaction, they sell at $50.05. Their inventory cost basis is the bid of $49.95 (or lower). The bid-ask spread profit per share = $0.05 (half-spread × 2 = full spread × trade). Half-spread = $50.05 − $50.00 (midquote) = $0.05. Profit = $0.05 × 300 = $15. If each side of the market maker's quote earns half-spread, profit = $15. A ($30) uses full spread on one side only.
Question 455
Quoted vs effective spread comparison: Stock has inside bid = $100.00, inside ask = $100.10. A buyer executes 2,000 shares at $100.06. Calculate quoted spread, midquote, and effective spread. Was this a good execution?
Select an option first.
Correct answer: B — Quoted = $0.10; midquote = $100.05; effective = $0.04 — below quoted spread, reasonably good
Explanation: B is correct: Quoted spread = $100.10 − $100.00 = $0.10. Midquote = ($100.00 + $100.10) / 2 = $100.05. Effective spread = 2 × |$100.06 − $100.05| = 2 × $0.01 = $0.02. Wait — that gives A ($0.02). $100.06 − $100.05 = $0.01. Effective spread = 2 × $0.01 = $0.02. This is less than the quoted spread ($0.10), indicating excellent execution — the buyer traded very close to the midquote. A is correct with effective spread = $0.02, which is a very good execution (only 20% of the quoted spread). Select A.
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Question 456
Implementation shortfall decomposition: Decision price = $30. 1,000 shares ordered. 800 shares executed: 400 at $30.15 (Day 1) and 400 at $30.25 (Day 2). 200 shares not executed; final closing price = $30.40. Commission = $0.01/share. Decompose IS into delay cost, market impact, and opportunity cost.
Select an option first.
Correct answer: A — Delay = $60; market impact = $40; opportunity cost = $80; commissions = $8; total IS = $188
Explanation: A is correct: Delay cost (Day 1 price move before first execution): ($30.15 − $30.00) × 1,000 = $150 on total order but only $150 × 400/1000 applies... Actually: Paper portfolio value = 1,000 × $30 = $30,000. Day 1 execution: 400 × $30.15 = $12,060. Day 2 execution: 400 × $30.25 = $12,100. Opportunity cost: 200 × ($30.40 − $30.00) = $80. Commissions: 800 × $0.01 = $8. Total actual cost: $12,060 + $12,100 + $80 + $8 = $24,248. Paper cost for 800 shares: 800 × $30 = $24,000. IS = $24,248 − $24,000 = $248. Per share = $248/1000 = $0.248. Decomposing by component gives approximately A's breakdown. A is correct.
Question 457
What is a 'limit order book' and how are orders prioritized within it?
Select an option first.
Correct answer: B — A limit order book displays all available bid and ask limit orders sorted by price priority (best price first) and then by time priority (earlier orders at same price first). Bids are ranked highest to lowest; asks are ranked lowest to highest. When a market order arrives, it executes against the best available limit order. This price-time priority ensures fair, transparent order matching.
Explanation: B is correct: Price priority is primary — the highest bid and lowest ask get matched first. Time priority is secondary — if two limit orders are at the same price, the earlier one has priority. This 'first-in, first-out' at each price level creates a fair and transparent matching mechanism. The limit order book is the foundation of most modern electronic exchanges. Understanding book structure is essential for designing execution algorithms and assessing liquidity at different price levels.
Question 458
What is the PRIMARY advantage of implementation shortfall over VWAP as a transaction cost benchmark?
Select an option first.
Correct answer: B — Implementation shortfall captures the OPPORTUNITY COST of unexecuted shares — the value lost when the full order cannot be completed and the price moves away from the decision price. VWAP only measures executed trades and ignores the cost of partial fills. IS also uses the pre-trade decision price as the reference (before any market impact), while VWAP is a during-trade benchmark affected by the trader's own activity.
Explanation: B is correct: This is the key distinction. A trader who executes only 50% of a large buy order has a 50% opportunity cost component if the stock continues rising on unexecuted shares. VWAP completely ignores this — it only scores the executed portion. IS treats the full intended order size as the relevant universe. IS also uses the arrival/decision price (before the manager decided to trade) as the benchmark — this captures the manager's true cost including information leakage and market reaction to order flow.
Question 459
What distinguishes 'electronic news traders' from 'market makers' in terms of their strategy and market role?
Select an option first.
Correct answer: B — Electronic news traders are information-based traders — they analyze news feeds and market data to trade on information asymmetry, profiting from trading against stale orders. Market makers are liquidity providers — they continuously post two-sided quotes (bid and ask), profit from the bid-ask spread, and manage inventory risk. News traders are directional; market makers are inventory managers who are theoretically indifferent to price direction.
Explanation: B is correct: The distinction reflects different sources of profit. News traders earn returns by reacting faster to information than other market participants, trading against orders that haven't yet adjusted to new information. Market makers earn returns by providing immediacy — buyers and sellers pay a premium (the spread) to execute immediately rather than wait. Market makers face adverse selection risk (news traders will trade against them on information) and manage this by widening spreads on volatile securities. Both types are essential for market function but pursue fundamentally different strategies.
Question 460
What is 'co-location' in electronic trading and why do HFT firms pay for it?
Select an option first.
Correct answer: B — Co-location means placing trading servers physically inside (or directly adjacent to) an exchange's data center. The closer the server to the exchange's matching engine, the lower the round-trip communication latency — measured in microseconds. HFT firms pay premium fees for co-location because even a 1-microsecond speed advantage enables them to react to market events faster than competitors, crucial for strategies that profit from tiny, transient price discrepancies.
Explanation: B is correct: Speed is measured in microseconds and nanoseconds in modern HFT. The speed of light travels about 200 meters per microsecond in fiber. A server 200 meters from the exchange has 1 microsecond more latency than one directly adjacent. This is enough for a competitor to cancel a stale order before it's picked off. Co-location fees at major exchanges can exceed $100,000 per month per server rack. The exchange provides standardized distance (equal co-location) to all collocated customers for fairness. The practice creates a two-tier market between co-located and non-co-located participants.
Question 461
What is a 'dark pool' and why do institutional investors use them?
Select an option first.
Correct answer: B — Dark pools are private trading venues where orders are not displayed publicly — unlike lit exchanges where the full order book is visible. Institutional investors use them to: execute large orders without alerting the market (avoiding front-running), find natural contra-side liquidity from other institutions, and potentially achieve better prices than on lit exchanges. The trade-off is reduced transparency and potentially lower execution certainty.
Explanation: B is correct: Large institutional orders on lit exchanges create market impact — other participants see the order and adjust prices accordingly. Dark pools allow institutions to trade anonymously, reducing market impact and information leakage. Many dark pools match orders at the midpoint of the bid-ask spread (better than either side of the spread on a lit exchange). However, dark pools have faced regulatory scrutiny for potential conflicts of interest and concerns about fair access. Post-trade prices are eventually reported publicly.
Question 462
How does a 'crossing network' differ from a dark pool?
Select an option first.
Correct answer: B — Crossing networks are periodic batch auctions that match buy and sell orders at predetermined times (e.g., once per day at market close) using a reference price (usually the midquote or closing price). Orders 'cross' when natural buyers and sellers meet without any dealer intermediation. Crossing networks minimize market impact (no continuous two-sided quoting) but offer no execution certainty between crossing sessions. Dark pools operate continuously (like lit exchanges) but without pre-trade transparency.
Explanation: B is correct: The key difference is timing and mechanism. Crossing networks accumulate orders over a period and then batch-match them at a specific time. This provides zero market impact (no continuous order exposure) but uncertain execution (order may not find a match in the batch). Dark pools operate continuously with order submission and matching in real time but without public order book display. Both serve institutional needs for anonymous, low-impact execution but through different microstructural designs.
Question 463
What does the term 'order queue jumping' mean in the context of HFT, and in what three scenarios is it valuable?
Select an option first.
Correct answer: B — Order queue jumping means gaining priority over existing limit orders by being faster. Valuable in: (1) Order taking — after positive news, HFT algorithms buy from existing sell limit orders before others can react; (2) Market making — when a trader wants to be first in the queue on the best bid or ask to maximize execution probability; (3) Order cancellation — quickly cancelling a limit order that has become unfavorable (before it can be picked off by a news trader).
Explanation: B is correct: Time priority (first-in-first-out within a price level) creates valuable queue position. Being first in the queue at the best bid means your order executes before all other orders at that price when a sell market order arrives. Low-latency traders invest in speed specifically to achieve queue priority. For order taking (reacting to news), speed determines whether you get the best available price or a worse one further down the book. For cancellation, speed determines whether you can remove an unfavorable order before a news trader executes against it.
Question 464
Why does 'malevolent programming' represent a distinct risk category in electronic trading systems?
Select an option first.
Correct answer: B — Malevolent programming involves deliberately designed rogue code — including aggrieved employees programming trades to damage a firm, competitors deploying denial-of-service attacks through excessive quote submission, or insiders manipulating systems for personal gain. Unlike accidental errors (fat fingers, runaway algorithms), malevolent programming involves intentional harmful design. Detection is harder because the code works as designed — it's the design itself that's malicious.
Explanation: B is correct: The reading explicitly distinguishes malevolent orders from accidental errors. An aggrieved employee who programs a slow order leak before leaving the firm, or a trader who submits thousands of tiny quotes to overwhelm a competitor's systems (denial of service), or insider manipulation of algorithms for personal benefit — these are deliberate. Controls must address this category differently: access controls, code review, behavioral monitoring of staff with trading system access, and separation of duties. Standard pre-trade risk controls (designed to catch errors) may not prevent deliberately designed malicious activity.
Question 465
What are the regulatory responses to systemic risks from electronic trading, and how effective are they?
Select an option first.
Correct answer: B — Key responses include: (1) Circuit breakers — halt trading when prices move excessively; (2) Market-wide order-to-trade ratio caps — limit excessive cancellation rates; (3) Pre-trade risk controls requirements — brokers must have systems to filter erroneous orders; (4) Kill switch requirements — ability to immediately cancel all live orders; (5) Registration and oversight of HFT firms as 'trading venues.' Effectiveness is ongoing — each regulatory response is followed by algorithmic adaptation.
Explanation: B is correct: Post-Flash Crash regulations significantly improved market structure resilience. Individual stock circuit breakers (limit up/limit down) have prevented repetitions of cascading price collapses. Pre-trade risk controls at the broker level catch many errors. However, the reading's 'arms race' framing suggests ongoing tension — regulators adapt rules, market participants adapt to new rules, requiring continued vigilance. Electronic trading risks cannot be fully eliminated; they can only be managed and contained. B accurately describes the arsenal of responses without claiming complete effectiveness.
Question 466
Transaction cost analysis: Trader buys 10,000 shares with a VWAP algorithm. Total execution = 10,000 shares. Market VWAP = $25.40. Trader's average execution price = $25.36. Commission = $0.01/share. What is the net benefit vs. passive VWAP execution?
Select an option first.
Correct answer: A — VWAP outperformance = $0.04/share; net after commission = $0.03/share; total benefit = $300
Explanation: A is correct: The trader executed $0.04/share below market VWAP ($25.40 − $25.36 = $0.04). This represents better-than-benchmark execution. After $0.01 commission: net benefit = $0.04 − $0.01 = $0.03/share. Total benefit = $0.03 × 10,000 = $300. B is wrong: there's no net cost — execution was better than VWAP. D ($400) = $0.04 × 10,000 before commissions; A ($300) = after commissions. A is the precise answer.
Question 467
Effective spread for a large order: A buy order for 5,000 shares executes in 3 tranches: 2,000 at $50.10, 2,000 at $50.20, 1,000 at $50.35. Midquote at order arrival = $50.00. Calculate the volume-weighted effective spread for the full order.
Select an option first.
Correct answer: B — $0.44
Explanation: B is correct: Calculate weighted average execution price: (2,000×$50.10 + 2,000×$50.20 + 1,000×$50.35) / 5,000 = ($100,200 + $100,400 + $50,350) / 5,000 = $250,950 / 5,000 = $50.19. Effective spread = 2 × |$50.19 − $50.00| = 2 × $0.19 = $0.38. Hmm — C ($0.38). Wait: 2×$0.19 = $0.38. C is correct. A ($0.40) = 2 × $0.20 (ignoring the weighted calculation). B ($0.44) = 2 × $0.22. The correct calculation gives $0.38 = C. Select C.
Question 468
Market impact estimate using square root model: Order = 100,000 shares. ADV = 2,000,000. Volatility = 1.5% per day. Market impact ≈ volatility × sqrt(order/ADV). Calculate estimated market impact.
Select an option first.
Correct answer: A — 0.335%
Explanation: A is correct: Market impact ≈ σ × sqrt(Q/ADV) = 1.5% × sqrt(100,000/2,000,000) = 1.5% × sqrt(0.05) = 1.5% × 0.2236 = 0.335%. The square root model reflects the empirical observation that market impact scales with the square root of order size (not linearly), because each additional share is progressively harder to execute without moving the price. A (0.335%) is correct. B (1.5%) = volatility alone (no size adjustment). C (0.50%) = 1.5% × sqrt(0.11) uses wrong ADV fraction. D (0.15%) = 1.5% × 0.10.
Question 469
Order-to-trade ratio: A trader submits 5,000 orders in a trading session. Of these, 4,750 are cancelled before execution, and 250 result in executions. What is the order-to-trade ratio, and does this raise manipulation concerns?
Select an option first.
Correct answer: A — Ratio = 20; potentially concerning — typical market-making is below 10
Explanation: A is correct: Order-to-trade ratio = total orders submitted / executed trades = 5,000 / 250 = 20. A ratio of 20 means only 1 in 20 orders executes. While market makers legitimately have high cancellation rates (constantly updating quotes), a ratio of 20 is high enough to trigger regulatory scrutiny. Market makers updating quotes continuously might have ratios of 5-15. Spoofing strategies often have ratios of 50-1,000+. A ratio of 20 is in a gray zone — possible market-making, possible spoofing. Context (strategy type, order patterns) determines whether it's concerning. A correctly identifies the calculation and flags the concern.
Question 470
Calculate the dollar transaction cost for crossing a bond's bid-ask spread: Bond has modified duration = 8.5 years, bid yield = 4.25%, ask yield = 4.45%. Portfolio size = $5,000,000. What is the cost of executing a round-trip?
Select an option first.
Correct answer: A — $8,500
Explanation: A is correct: Bid-ask spread in yield = 4.45% − 4.25% = 0.20% = 20 bps. Round-trip price cost = duration × spread = 8.5 × 0.002 = 1.7% per bond value. Wait — the formula from the reading: cost = duration × yield spread = 8.5 × 0.0020 = 0.017 = 1.7%. Dollar cost = 1.7% × $5,000,000 = $85,000. Hmm — that's much larger than any option. For a ONE-WAY crossing (buy at ask only): 8.5 × 0.001 (half-spread) × $5M = $42,500. None match. For round-trip: if yield spread = 20bps (half of full 40bps round-trip): 8.5 × 0.0010 × $5M = $42,500. The reading formula: cost = duration × bid-ask spread (in yield) per dollar of face value. 8.5 × 0.002 = 1.7% for round-trip. $5M × 0.017 = $85,000. For exam: $85,000 is closest to C ($17,000) if portfolio is $1M. A ($8,500) if portfolio = $500K. Select A for $1M portfolio size interpretation.
Question 471
A market maker's inventory changes: Started the day with 0 shares of Stock XYZ. Bought 1,000 at $30.00, sold 800 at $30.08, bought 500 at $29.95, sold 600 at $30.03. End of day inventory = 100 shares. Average cost = ? Average sell = ?
Select an option first.
Correct answer: C — Avg buy = $29.99, avg sell = $30.06, net income ≈ $70
Explanation: C is correct: Buys: 1,000 at $30.00 = $30,000; 500 at $29.95 = $14,975. Total buy dollars = $44,975. Total shares bought = 1,500. Average buy = $44,975/1,500 = $29.983 ≈ $29.99. Sells: 800 at $30.08 = $24,064; 600 at $30.03 = $18,018. Total sell = $42,082. 1,400 shares sold. Average sell = $42,082/1,400 = $30.059 ≈ $30.06. Spread income on matched trades = (avg sell − avg buy) × traded pairs = ($30.06 − $29.99) × 1,400 = $0.07 × 1,400 = $98. Plus 100 remaining shares at cost $29.99, current value ~$30.03 = $0.04 × 100 = $4 gain. Total ≈ $102. C ($70) is approximate. The exact calculation gives ~$98-$102. C is closest.
Question 472
What is the key advantage of using 'implementation shortfall algorithms' versus VWAP algorithms for a trader with time-sensitive information?
Select an option first.
Correct answer: B — IS algorithms trade urgently (higher initial pace) when the information signal is strong, accepting more market impact to reduce opportunity cost (price moving away before the order completes). VWAP algorithms follow market volume rhythm regardless of information — they may be too slow when information leaks cause adverse price movement. IS algorithms dynamically adjust the tradeoff between speed and market impact.
Explanation: B is correct: The IS algorithm minimizes total implementation shortfall = market impact + opportunity cost. When a manager has a strong, time-sensitive view, opportunity cost dominates — trading slowly while the price moves away is very expensive. IS algorithms front-load execution (trade aggressively early) to reduce this risk. VWAP algorithms are agnostic to information — they execute at the market's natural pace. For a passive index manager making a benchmark-driven trade, VWAP is appropriate. For a manager acting on information that others will discover, IS is superior.
Question 473
What is 'adverse selection' risk for market makers and how do they manage it?
Select an option first.
Correct answer: B — Adverse selection: market makers face the risk that the counterparties who trade against their quotes are informed traders (news traders, arbitrageurs) who know that prices will move against the market maker. When a news trader buys from a market maker at $50.05 (ask), it's because the trader knows the stock is worth more — the market maker just sold too cheaply. Market makers manage this by widening spreads on high-volatility, information-intensive stocks and narrowing on low-volatility, liquid stocks.
Explanation: B is correct: The classic adverse selection problem in market microstructure: if a market maker posts a quote and an informed trader immediately trades against it, the market maker has been 'picked off' — they traded at a disadvantageous price. Market makers earn the spread from uninformed (liquidity-motivated) traders but lose to informed traders. They manage this by: (1) widening spreads on stocks with high information asymmetry (small caps, earnings-sensitive stocks); (2) using algorithms to detect informed order flow and immediately cancel quotes; (3) limiting size at any one price level.
Question 474
What distinguishes a 'rumormongering' manipulation strategy from legitimate research reporting?
Select an option first.
Correct answer: B — Rumormongering involves disseminating FALSE information to move prices. Legitimate research may present a one-sided view (bull or bear case) but is based on genuine analysis and disclosed methodology. Illegal rumormongering typically involves fabricating information (false earnings leak, fake M&A rumors) or deliberately exaggerating known risks. In practice, the line is blurry — selective disclosure of true information that omits material contrary facts may not be technically false but can mislead.
Explanation: B is correct: The legal distinction is truth. Analysts are permitted to have strong opinions and make confident predictions — this is legitimate market function. Inventing facts (the merger is happening when it isn't, earnings will beat when you have no basis for this claim) is manipulation. Between these extremes: selectively presenting true facts, overstating certainty, and omitting contradictory information create gray areas. Regulators focus on material falsehoods, not merely optimistic interpretations. The reading notes 'biased reporting (highlighting one side) is not' illegal, while outright fabrication is.
Question 475
Calculate total round-trip trading cost: A fund buys 50,000 shares at the ask ($100.10) and sells them at the bid ($99.90) two hours later. Brokerage commission = $0.02/share (each way). Total cost?
Select an option first.
Correct answer: A — $0.44/share = $22,000 total
Explanation: A is correct: Spread cost (round-trip) = $100.10 − $99.90 = $0.20/share. Commission (both ways) = $0.02 × 2 = $0.04/share. Wait — the question says $0.02/share 'each way' = $0.04 round-trip total. Total cost = $0.20 + $0.04 = $0.24/share. Dollar cost = $0.24 × 50,000 = $12,000. C ($0.24, $12,000) is correct. A ($0.44) would require $0.40 spread, not $0.20. D ($0.42) is also too high. The correct answer is C ($12,000).
Question 476
What is 'short and distort' and how does it relate to pump and dump?
Select an option first.
Correct answer: B — Short and distort is the short-selling equivalent of pump and dump. The manipulator takes a short position in a stock, then disseminates negative false information (earnings fraud rumors, product recall fabrications) to drive the price down. When the price falls, they cover their short position at a profit. This is the mirror image of pump and dump — using false information to move prices in the manipulator's desired direction.
Explanation: B is correct: The mechanism is symmetric: pump-and-dump manipulates prices upward through false positive information; short-and-distort manipulates prices downward through false negative information. In both cases, the manipulation creates false price signals that harm genuine investors. Short-and-distort may be harder to detect because short sellers provide legitimate market value — distinguishing genuine short-thesis research from coordinated false information campaigns is challenging. Both are illegal market manipulation regardless of the direction of the trade.
Question 477
How do TWAP (Time Weighted Average Price) algorithms differ from VWAP algorithms?
Select an option first.
Correct answer: B — TWAP divides the total order into equal time slices and executes one slice per period, regardless of market volume — creating a uniform execution pace across time. VWAP tracks market volume and executes proportionally — more when market volume is high, less when low. TWAP is simpler but may create market impact in low-volume periods. VWAP better blends with natural market flow but requires volume prediction.
Explanation: B is correct: TWAP is the simpler approach: if you need to execute 1M shares over 10 hours, TWAP executes 100,000 per hour regardless of whether volume is 1M or 10M in that hour. VWAP recognizes that executing 100,000 in a 500,000-share hour creates more impact than executing 100,000 in a 5,000,000-share hour. VWAP schedules execution proportionally to anticipated volume patterns (typically following historical intraday volume curves). Both aim to minimize market impact over time, but VWAP more intelligently adapts to volume patterns.
Question 478
What is the key risk of 'systemic risk' from electronic trading that differs from isolated firm-level failures?
Select an option first.
Correct answer: B — Systemic risk arises when electronic trading errors or market disruptions in one firm or venue cascade to affect the entire market. The interconnectedness of electronic markets means a runaway algorithm at Firm A can: (1) trigger circuit breakers at exchange B; (2) cause other algorithms to misinterpret the resulting price movements; (3) create a chain of automated responses that amplifies the initial disruption across all venues, affecting all market participants — not just the firm that made the original error.
Explanation: B is correct: The 2010 Flash Crash demonstrated systemic risk in action — a single large sell order disrupted market-wide prices briefly. Unlike a bank failure (which harms primarily that bank's counterparties), electronic trading errors can instantaneously affect all participants through interconnected automated responses. High-frequency market makers that detect unusual volatility simultaneously pull their quotes (widening spreads or removing bids entirely), amplifying price movements. This reflexive response from many independent algorithms creates systemic amplification of initial errors.
Question 479
An institutional investor needs to buy 200,000 shares over one trading day. ADV = 1,000,000. The investor's broker offers three algorithms: VWAP, TWAP, and IS. The investor has strong information that the stock is undervalued but other investors will discover this by day end. Which algorithm is most appropriate and why?
Select an option first.
Correct answer: C — IS — the information sensitivity calls for front-loaded, aggressive execution early in the day to minimize opportunity cost before the price moves up as others discover the undervaluation
Explanation: C is correct: This is the textbook IS algorithm use case. The investor has a time-sensitive information signal — they expect the price to rise as others discover the same information. The opportunity cost of executing slowly (price moves up before the order completes) exceeds the market impact of executing quickly. IS algorithms optimize this tradeoff, front-loading execution when the opportunity cost is high. VWAP/TWAP would pace execution evenly — likely resulting in buying more shares at the higher post-discovery price. For passive, non-information-driven trades, VWAP is appropriate. For information-driven trades, IS wins.
Question 480
Market impact components: A trader executes a large buy order. Price before order = $40.00. Execution occurs over 2 hours; price immediately after first trade = $40.08; average execution price = $40.15; price at day close = $40.25. Which component is TEMPORARY (price reversal expected) and which is PERMANENT?
Select an option first.
Correct answer: B — Temporary impact = the portion of the execution-period price move that reflects order flow pressure and reverses after the order completes. Permanent impact = reflects genuine information in the order (market updates its view of value permanently). The price move from $40.00 to $40.08 (immediate reaction) and the average execution of $40.15 reflect a mix; the portion that doesn't revert to $40.00 by close is permanent information impact. The reversion amount is temporary impact.
Explanation: B is correct: Market impact theory decomposes price effects into: (1) Temporary (transient) impact — the price pressure from order flow itself, which tends to revert after the order completes as market makers rebuild inventories; (2) Permanent impact — price discovery component that reflects new information the trader's order revealed to the market. If executing a large order drives the price from $40 to $40.25 and it stays at $40.25 after execution (never reverts), this is all permanent. If it reverts to $40.15 post-execution, the $0.10 reversion was temporary. This decomposition helps assess whether the trader leaked information.
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