Guides

The fees Amazon charges an FBA seller: referral fees by category, fulfillment fees, storage and the other charges, with a worked example of profit per unit.

Why a 3x ROAS can lose money, how to work out the ROAS your margin needs to break even, and how to set a target ROAS that leaves a profit.

Every fee Etsy charges a US seller on a sale, how each is worked out, a full example, and why cheap items lose a bigger share to fees.

What free shipping does to the profit on each order, the three ways to pay for it, and how to set a free shipping minimum that covers the label.

A step-by-step way to set a price that covers product cost, fees, shipping and ads and still leaves the margin you want, with a full worked example.

How many extra sales a discount needs, a table by margin and discount, cheaper alternatives to a straight discount, and how to judge a sale afterwards.

Margin and markup use the same profit but give different numbers. How each works, how to convert between them, and the pricing mistakes that follow.

What Shopify charges besides the plan: card rates by plan with Shopify Payments, the extra fee for other providers, and when upgrading pays for itself.