Auction and pacing simulations for ads lift

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Simulations make lift estimates cheaper by testing policies before we spend budget. They are especially useful when experimentation cycles are long or randomized control is limited.

What to simulate

  • Auction outcomes: bid distributions, win rates, and clearing prices under new models.
  • Pacing and budgets: how new policies change spend velocity and delivery profiles.
  • Creative selection: whether creative policies skew delivery to certain cohorts or geos.

How to keep simulations honest

  • Replay production traffic with realistic throttling and consent-aware analytics.
  • Compare counterfactuals against holdout policies; calibrate against recent experiments.
  • Capture guardrails (CPC, CPA, ROI) with the same thresholds used in rollout gates.

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