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Seasonality without a made-up index
Holidays, harvests, and storms are real. A percentage you invented is not.
A holiday week, a produce harvest, or a storm can make the same lane harder to cover than last month. Say that in plain words. Do not attach a tightness percentage this lounge did not measure.
If the carrier's transit is an estimate, keep it an estimate unless a guarantee product was actually bought. Missed pickups do not always recover the same week.
The course that goes further is Broker foundation. Reading this note does not enroll you.