TL;DRThe aged inventory surcharge jumps from $1.50 to $5.45 per cubic foot between the 241-270 and 271-300 day bands.Q4 base storage is about 3.1× the rest of the year for standard size: $0.78 rising to $2.40 per cubic foot.The surcharge starts at 181 days, and Amazon takes its measurement on the 15th of each month.A slow-moving example costs $238.45 a month against $17.55 for the same product moving quickly.Short version: storage is not a flat overhead, it is a penalty schedule with a … Continue reading Day 271: When Storage Goes From $1.50 to $5.45