Item Market History 📖 How do I use this?

Items
📖 How do I use this?
Price Trend 📖 How do I use this?
History of recorded prices
Stock History 📖 How do I use this?
Metric for selected items
Inflation Index (base=100) 📖 How do I use this?
Weighted median of per-item price inflation factors. Weight = stock value ( )/1000 (prefers ValuationHistory; falls back to stock*price).
Velocity (per item) 📖 How do I use this?
Daily velocity metrics for your selected items
Velocity (combined) 📖 How do I use this?
Sum across selected items (and optional normalization)