One of the powers the president has is the ability to

appoint senators.
approve pardons.
appoint mayors.
confirm judges.

one of the power that president has is the ability to : approve pardons Under article II section 2, the president of the united states has the power to grant reprieves and pardons for the act of offences against the United States (the only exception is if that offences related impeachments to the country)

high entry costs prevent new producers from entering the market.

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.