Margin SellerProfit research for marketplace sellers

Margin Seller resources

Seller glossary for Amazon and Walmart sellers

Clear definitions of the profit, sourcing, and advertising terms sellers use to evaluate products.

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How to use these resources

Connect the measures before comparing products

Seller metrics answer different questions. Use profit margin for profit relative to revenue, ROI for profit relative to invested cash, and sourcing thresholds to test a specific selling or buying price.

  1. 01

    Return measures: ROI and profit margin

    These ratios use different denominators; define the cost basis before comparing them.

    ROI for resellersProfit margin
  2. 02

    Sourcing thresholds: break-even and maximum buy price

    Break-even is a selling-price reference; maximum buy price is a supplier-cost ceiling under a chosen return target.

    Break-even priceMaximum buy price
  3. 03

    Marketplace cost: referral fee

    Verify marketplace, category, and current terms; keep referral costs distinct from fulfillment costs.

    Marketplace referral fee
  4. 04

    Advertising ratios: ACOS and TACOS

    Both compare ad spend with sales, but their sales denominators differ and neither is a profit measure.

    ACOS vs TACOS

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Seller resources

6 resources
ROI for resellersROI for Resellers: Meaning and Calculation | Margin SellerUnderstand reseller ROI, distinguish it from profit margin, and compare estimated return with invested unit cost. Use one consistent cost basis per product.Profit margin for marketplace sellersProfit Margin for Amazon and Walmart Sellers | Margin SellerUnderstand product profit margin, how it differs from ROI, and which marketplace and operating costs belong in a seller estimate. Compare both on a listing.Break-even price for a marketplace productMarketplace Break-Even Price for Sellers | Margin SellerLearn how a marketplace break-even price covers product cost, fees, fulfillment, and other costs. Stress-test your target selling price before sourcing.Maximum buy price for product sourcingMaximum Buy Price Guide for Sellers | Margin SellerSee how maximum buy price compares supplier quotes with target ROI after marketplace costs. Set your highest acceptable purchase cost before committing cash.Marketplace referral feeMarketplace Referral Fee Guide for Sellers | Margin SellerUnderstand marketplace referral fees, why category and sale details matter, and how to verify fee inputs. Check official fee schedules before sourcing.ACOS vs TACOS for marketplace sellersACOS vs TACOS for Marketplace Sellers | Margin SellerLearn how ACOS and TACOS differ and how ad scenarios affect profit and sourcing decisions. Compare both before setting a seller's ad budget for a product.

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Profit calculators Seller guides Marketplace comparisons Sourcing playbooks