The two safety stock formulas — the simple max method and the statistical service-level method — with worked examples, a Z-factor table, and the multi-channel catch.

The 6 best inventory tools for Shopify brands in 2026, ranked by who each fits — SKU Compass, Inventory Planner, Shopify native, Cogsy, Cin7, Katana.

Amazon FBA storage fees roughly triple in Q4. How the peak vs off-peak structure works, the aged-inventory surcharge, and how forecasting keeps storage costs down.

The four inventory forecasting types — trend-based, seasonal, causal, and blended/ML — explained, with which SKU profile each fits and why multi-channel brands blend all four.

Five patterns ecommerce agencies use to manage multi-brand inventory in 2026, the capability matrix, and which pattern survives past 10 client brands. The honest operator playbook.

2026 FBA capacity mechanic: how Amazon calculates your quarterly limit, what happens when you hit the cap, and the 6-step operator playbook for staying inside it while keeping sales velocity intact.

Six inventory tools mid-market ecommerce agencies use to manage multiple client brands in 2026, ranked by multi-tenant access, combined-volume pricing, per-brand reporting, and agency-fit.

2026 comparison of the three PO tracking approaches — spreadsheet, standalone PO software, integrated forecasting. The real test: does the open-PO data reach your forecast?

Inventory forecasting predicts demand and computes reorder math. Inventory planning sets strategic SKU + capital decisions. Different cadence, different owners, but both required.