for Wowhead, via The Undermine Journal
- "Market Price": The cost, per each, to buy the cheapest 15% of the total available quantity of a given item at one instant in time on one realm.
- "Current Price": The market price at the most recent data snapshot.
- "Mean Price": A mathematical mean (or "average") of market prices. Sum up all the prices, divide by the count of prices. Simple. This could use the prices of one item on one realm over time, or the current prices of one item across all realms in a region.
- "Median Price": The midpoint of a sorted list of "market prices". This could use the prices of one item on one realm over time, or the current prices of one item across all realms in a region.
- "Global Price": The average value of the US and EU region median prices, as observed 8 times across the past 24 hours.