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Nadia Cole
E-commerce Analyst
Covers Amazon, Shopify, and marketplace profitability. Focused on the fee structures and margin levers that determine whether a product actually makes money.
Background in e-commerce operations and marketplace analytics. Has advised sellers across Amazon, Shopify, and eBay on pricing, fulfillment economics, and cost optimization.
Articles by Nadia Cole
8 articles published
E-commerce Hidden Amazon Seller Costs That Most Profit Calculators Miss
Beyond referral fees and FBA fees, Amazon sellers face at least eight additional cost lines. Here is every one, what it costs, and how to model it.
E-commerce Dropshipping Profit Margins in 2026: The Real Numbers After Every Cost
Dropshipping margins look great on paper. Five hidden cost lines between gross and real profit tell a different story — benchmarks + math by niche.
E-commerce eBay Seller Fees in 2026: Every Cost Between Sale Price and Profit
eBay charges four fee layers on every sale. Most sellers track only one or two. The full stack + category rates + a real per-item profit model.
E-commerce How to Calculate Amazon FBA Profit: A Step-by-Step Breakdown
Walk through each fee line that sits between your Amazon selling price and your actual profit. Worked example with real numbers and a free calculator.
E-commerce Amazon FBA Fees in 2026: The Full Cost Stack Most Sellers Undercount
Amazon takes six separate cuts from every FBA sale. Most sellers track three. Here is the full fee stack, what each one costs, and how to model real profit.
E-commerce Amazon Seller Profit Margins by Category: 2026 Benchmarks
Realistic net profit margins across 12 Amazon categories with 2026 benchmarks. Compare your margin to category norms in under a minute.
E-commerce FBA vs FBM: Which Amazon Fulfillment Method Is More Profitable in 2026?
Side-by-side cost breakdown of FBA vs FBM fulfillment. Compare fees, shipping costs, and real profit margins to choose the right model for your Amazon business.
E-commerce Shopify Profit Margins in 2026: Four Costs Beyond the Dashboard Number
Four costs live outside Shopify's headline number: variable COGS, payment fees, shipping loss, and ad spend. Here's how each compounds in 2026.