A clean quantitative framing is this: 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. Relying on VWAP alone can mask poor strategic decisions that happened before the order reached the desk. 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. That is usually where the edge is: not in the vocabulary, but in the structure underneath it.