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Also discussed issue DER-84, which points to the need to clarify how commodity underlying assets are specified.  A commodity instrument may have any number of things as their underlier - indices, prices, volatility of prices, etc.  The underlying commodity asset (of which there may be more than one) may be deliverable or strictly a reference asset.  The reference asset may be a price, index, volatility, or commodity that can't be delivered, such as some aspect of the weather, as well as a negotiable commodity whereas a deliverable asset must be a negotiable commodity that has is a physical thing that can be delivered to the buyer, such as bushels of corn, energy credits, etc. but probably not weather, freight routes, or services per se.  Our current model doesn't allow for this distinction the distinction between reference and deliverable (as even an index will have some sort of reference commodity) and should be augmented accordingly.