{
  "industry": "Janitorial Services",
  "naics": "561720",
  "metro": "Lancaster, PA",
  "grain_of_margin": "national",
  "national_net_margin_pct": 21.2,
  "metro_establishments": 125.0,
  "metro_employment": 1080.0,
  "metro_avg_weekly_wage": 661.0,
  "note": "Margin is national. Counts + wage are metro (CBSA) grain. No local margin exists."
}