What is coney island and the angel island

Coney Island is a peninsular residential neighborhood, beach, and leisure/entertainment destination on the Coney Island Channel, which is part of the Lower Bay in the southwestern part of the borough of Brooklyn, New York City. The site was formerly an outer barrier island but became partially connected to the rest of Long Island by land fill. The residential portion of the peninsula is a community of 60,000 people in its western part, with Sea Gate to its west, Brighton Beach and Manhattan Beach to its east, the Lower Bay to the south, and Gravesend to the north.

Coney Island is well known as the site of amusement parks and a seaside resort. The attractions reached a historical peak during the first half of the 20th century, declining in popularity after World War II and years of neglect. In recent years, the area has seen the opening of MCU Park stadium and has become home to the Brooklyn Cyclones minor league baseball team, as well as the opening of a new amusement park among several adjacent ones.Angel Island is an island in San Francisco Bay offering expansive 360° views of the San Francisco skyline, the Marin County Headlands and Mount Tamalpais. The entire island is included within Angel Island State Park and is administered by California State Parks. The island, a California Historical Landmark,[1] has been used for a variety of purposes, including military forts, a US Public Health Service Quarantine Station, and a US Bureau of Immigration inspection and detention facility. The Angel Island Immigration Station on the northeast corner of the island, where officials detained, inspected, and examined approximately one million immigrants, has been designated a National Historic Landmark.[2]

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.