Which statement about monopoly is untrue?

The statement that a market form where there are many sellers but a single buyer is untrue regarding monopoly because this description aligns more accurately with a different market structure known as monopsony. A monopsony is characterized by a single buyer facing multiple sellers, which is quite different from a monopoly where there is only one seller in the market providing goods or services to multiple buyers.

In a monopoly, the defining feature is the presence of a single seller who dominates the market. This seller has significant pricing power because there are no direct competitors. The other statements accurately describe characteristics of a monopoly. For example, having the ability to unilaterally change the price and having complete control over the products and services offered are key aspects of a monopolistic market. Therefore, the identification of the first statement as untrue correctly highlights that it does not align with the fundamental concept of monopoly.