A global rule that's right on average is wrong for almost every specific store. This week's dispatch is about why every threshold in Magistry is calibrated to your own distribution, and why 'right on average' is a trap.
The average store doesn't exist
A ROAS floor of 2.0 might be the population mean. But your store has a margin structure, a repeat rate, and an acquisition mix that the mean ignores. Apply the average and you starve your winners or scale your losers — sometimes both at once.
Ranking tells you the order. Calibration tells you the threshold. The threshold is where the money is.
Self-calibration isn't a luxury feature; it's the difference between an agent that acts on your reality and one that acts on a podcast's. Stability gates keep the calibrated thresholds from chasing noise — they move on sustained signal, not a single good day.