Answer:
1 and 11
Explanation:
A monopoly is a market structure with only one seller supplying a unique product to a large number of people. In a monopoly, the sole supplier faces no competition from other firms. The uniques product that the firm sell has no close substitutes. A monopoly control supplies to the market and determines the price of the product.
Entry barriers, such as colossal capital requirement cause the emergence of monopolies. Strategic geographical location and the availability of natural resources can result in natural monopolies. Technological advancements, patents and copyrights may also give rise to monopolies.
