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Discretionary traders suffer from blind spots: subjectivity, lack of rigor, and insufficient discipline
  • Nang lists three blind spots: (1) Subjectivity – traders rely on “hand‑wavy” intuition; (2) Rigor – insufficient research and testing of entry/exit rules; (3) Discipline – failure to stick to a plan.
  • He argues that these blind spots cause inconsistent performance.
  • Quant traders mitigate these by codifying rules, back‑testing, and automating execution.
  • The contrast explains why some discretionary traders can still be successful if they impose systematic checks.
Rishi NangTitans Of Tomorrow00:11:16

Supporting quotes

The second thing is rigor. So when you want to answer one of these questions what do I mean by a trend or how much should I buy? When should I sell? You can be sloppy with that too or you can really dive deep and do a lot of research into the answer to that question. Rishi Nang
And then I think again discretionary traders expect can end up being a little blind spot. Rishi Nang

From this concept

Quant vs. Discretionary: The Art-Science Spectrum

Nang frames quant trading as a blend of scientific implementation and artistic design. He highlights the key blind spots that discretionary traders overlook and the rigor that quant traders must embed.

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