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Faster CAC Payback (<6 months) improves cash flow quickly. Longer payback (>12 months) deepens the J-curve requiring more capital.
Past your efficiency peak, a 10% spend increase might yield only 5% revenue growth, degrading net profit margin due to diminishing returns.
While the container can physically hold ~47,000 lbs, US road weight limits generally restrict the cargo to 37,000-44,000 lbs depending on the chassis (tri-axle vs standard) and state permits.
Most standard warehouse slabs are 6" reinforced concrete rated for 4,000 PSI compressive strength or 500-750 PSF distributed load.
FedEx uses 139 divisor for domestic shipments in 2026. The old 166 divisor results in 16% lower DIM weight charges.
A 24x24x24 box = 13,824 cubic inches / 139 = 99.5 lbs DIM weight, billed as 100 lbs. Heavy charge for a cube.