For each WoW realm/faction an average daily total Market Value of last 14 days is found.
Market Volume uses various methods to exclude extreme and unreliable auction house posts, resulting in a stable metric for economic activity.
ESBP is a price of chosen 'Essentials Shopping Basket' for the realm. ESBP Index is ratio of basket price and median among all region auction houses.
Higher ESBP and Index means that realm is more expensive and that gold should be valued less on it.