Freelancing 
Profitability 
Pricing 
Growth Metrics 
Revenue 
Employment 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 — no inventory, no warehouse. The five hidden cost lines between gross margin and real profit tell a different story. Here are the benchmarks and the math.
E-commerce eBay Seller Fees in 2026: Every Cost Between Sale Price and Profit
eBay charges four distinct fee layers on every sale. Most sellers track one or two. Here is the full fee stack, category-specific rates, and how to model real per-item profit.
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 for Amazon sellers across 12 product categories. Data-backed benchmarks to evaluate whether your margins are healthy or at risk.
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
The four costs that live outside Shopify's headline number — variable COGS, payment processing, shipping loss, and ad spend — and how each one compounds into your real 2026 margin.