When you strip the noise away, the real question is simple: vWAP is a participation benchmark, not a quality benchmark. Mechanism: VWAP tells you whether your execution tracked the market's trading pattern. It does not tell you whether you should have traded at all, or whether your timing was strategic. Why it matters: Relying on VWAP alone can mask poor strategic decisions that happened before the order reached the desk. $$ VWAP = \frac{\sum (Price_i \times Volume_i)}{\sum Volume_i} $$ Plain English: VWAP is the volume-weighted average price: the average price per share traded across the day. Market translation: An algo that beats VWAP by 2 bps but trades into a day when the stock moved 3% against you is still a bad outcome at the portfolio level. Failure mode: The mistake is celebrating VWAP outperformance without checking arrival price or opportunity cost. Review question: Write down the state variable you would monitor first if this thesis started to drift. The point is not to memorize the label. The point is to know what variable is actually doing the work.