{
  "kind": "original reproducible teaching examples",
  "updated": "2026-10-09",
  "limits": "Synthetic arithmetic, not store/customer/testimonial results. Excludes unlisted costs. No prediction or legal/tax conclusion.",
  "cases": [
    {
      "case": "margin-vs-markup",
      "scenario": "synthetic",
      "price_pln": 100,
      "product_pln": 60,
      "shipping_pln": 0,
      "payment_fee_pct": 0,
      "ads_pln": 0,
      "contribution_before_ads_pln": 40,
      "remaining_after_ads_pln": 40,
      "margin_pct": 40,
      "markup_pct": 66.6666666667,
      "formula": "(price-product-shipping-paymentFee)/price"
    },
    {
      "case": "landed-cost",
      "scenario": "synthetic",
      "price_pln": 149,
      "product_pln": 45,
      "shipping_pln": 15,
      "payment_fee_pct": 2,
      "ads_pln": 35,
      "contribution_before_ads_pln": 86.02,
      "remaining_after_ads_pln": 51.02,
      "margin_pct": 34.2416107383,
      "markup_pct": "not used",
      "formula": "price-product-shipping-price*feePct/100-ads"
    },
    {
      "case": "break-even-before-excluded-costs",
      "scenario": "synthetic",
      "price_pln": 199,
      "product_pln": 80,
      "shipping_pln": 0,
      "payment_fee_pct": 2,
      "ads_pln": 0,
      "contribution_before_ads_pln": 115.02,
      "remaining_after_ads_pln": 115.02,
      "margin_pct": 57.7989949749,
      "markup_pct": "not used",
      "formula": "price-product-shipping-price*feePct/100; excludes fixed costs/tax/refunds"
    }
  ]
}