The term 'carry' in financial markets refers to the cost of holding a financial instrument or commodity. In the context of commodities, a commodity is said to be in 'carry' when it is being stored rather than being traded. This concept is akin to the financial cost of carry in financial markets. The forward price of a commodity in a carry market compensates the owner for the cost of storage. This becomes more apparent in the case of commodities, as the process of producing and distributing them often involves storing them. Therefore, the term 'carry markets' accurately describes commodity markets where the forward price of the commodity compensates the owner for the storage cost.

Choice A is incorrect. Discount markets refer to markets where securities are bought and sold at prices lower than their face value, which is not related to the concept of storage costs in commodity futures markets.

Choice B is incorrect. Free markets are economic systems where prices for goods and services are self-regulated by buyers and sellers negotiating in an open market. This term does not specifically refer to commodities that include storage costs in their forward price.

Choice D is incorrect. Forwards markets involve contracts that agree on a set price for a future transaction, but this term does not imply whether or not storage costs are included in the forward price of commodities.