Invisible Supply
Physical stocks of a commodity that are available for delivery upon futures contracts, but whose quantities cannot be accurately identified.
Investopedia Commentary
The invisible supply of commodities underlying futures contracts can be found in the hands of different manufacturers, producers, and wholesalers. Because this lump of goods is located outside of conventional commercial channels, accurate accounting for the quantities available is difficult.
See also: Actual, Approved Delivery Facility, Cash Commodity, Certificated Stock, Commercial Grain Stock, Commodity, Futures Contract, Grading Certificate