{
  "demand": 20,
  "stages": [
    {
      "name": "Mine release",
      "capacity": 18,
      "availability": 90,
      "variableCost": 2.4,
      "fixedCost": 14
    },
    {
      "name": "Rail corridor",
      "capacity": 14,
      "availability": 85,
      "variableCost": 7.6,
      "fixedCost": 42
    },
    {
      "name": "Port stockyard",
      "capacity": 16,
      "availability": 90,
      "variableCost": 2.8,
      "fixedCost": 20
    },
    {
      "name": "Vessel loading",
      "capacity": 15,
      "availability": 0,
      "variableCost": 3.2,
      "fixedCost": 16
    }
  ]
}