Symptom
The distortion lives in blended gross margin — arithmetic averaging across all orders produces a single figure that conceals the distribution width and the growing share of near-breakeven transactions
Cause
Discount-driven orders free-shipping qualifying orders and shipping-heavy SKUs each produce gross margins below the thirty percent overhead coverage threshold — three distinct mechanisms visible in Shopify Profit by order but invisible in the aggregate
Impact
Twenty-one percent of orders below thirty percent gross margin generate negative operating contribution — each order actively reduces total operating profit and scaling volume at current distribution structure dilutes margin efficiency by ten to twenty-five percent