Who it is for
eBay sellers and agencies checking whether proposed volume-pricing tiers still clear a seller-selected contribution floor after realistic combined-shipping and packaging costs.
Delivery: usually a structured result, workbook, or ZIP depending on the tool.
How it stays safe
Friday performs arithmetic only on the listing aliases, prices, quantity tiers, discounts, marketplace-fee terms, product costs, shipping collected, shipping and packaging costs, and contribution floors you provide. It reads no eBay account, listing, order, shipping policy, promotion, rate table, or carrier source and verifies no field. A viable scenario predicts no demand, conversion, eligibility, sales lift, or Featured Offer outcome; a shipping reduction is equation context, not packaging, carrier, or product-safety advice. Friday creates no promotion, changes no price, listing, shipping rule, inventory, or account, does not publish listings, and does not modify a seller account.