The answer is Monopoly, which happens when only one firm sells the product in which typically marketing plays a small role in a monopolistic setting because it is controlled by the state or federal government. In addition, in a monopoly market, the seller faces no competition as he/she is the sole trader of goods with no close additional and the aspects like government certificate, ownership of assets, exclusive rights and patent and high starting cost make a unit a single seller of goods. All these aspects limit the entry of other traders in the market that also own some information that is not recognized by other sellers.
