{
  "operating": {
    "revenue": {"model": "volume_price"},
    "working_capital": {
      "model": "days",
      "ar_days": 5,
      "ap_days": 55,
      "inv_days": 75,
      "include_inventory": true
    },
    "da": {"model": "pct_revenue", "pct": 0.025},
    "capex": {"model": "pct_revenue", "pct": 0.035}
  }
}