What Inventory Means
CardTrader is the primary source for inventory, seller depth, listings, and marketplace supply. NeoCardAlpha separates total inventory, seller count, listing count, and condition-aware inventory where the data supports it.
Seller concentration matters. Ten copies from one seller is not the same market as ten sellers with one copy each.
Limits
Falling inventory does not prove demand by itself. Price movement alone does not prove a buyout.
Supply recovery can cool an earlier signal. Shallow supply increases uncertainty even when the price is moving.