All of the following examples of unemployment are correctly paired with their causes except

frictional: retired people and volunteer workers
structural: new technologies make certain skills unneeded
cyclical: businesses produce more than they can sell and lay off workers
seasonal: professional athletes during their off-season

Frictional: retired people and volunteer workers.

Explanation:

Frictional unemployment is a constant in any economy. It´s caused by temporary employment transitions, as workers and employers may lack some information. For example, someone looking for their very first job may not have enough resources to find a suitable job and ends up not taking other employment, temporarily holding out. On the other hand, a business may refrain from hiring new employees if they think there´s no one enough qualified available when there actually is.

angel island immigration station was an immigration station located in san francisco bay which operated from january 21, 1910 to november 5, 1940,[4] where immigrants entering the united states were detained and interrogated. angel island is an island in san francisco bay. it is currently a state park administered by california state parks and a california historical landmark. the island was originally a fishing and hunting site for coastal miwok indians, then it was a haven for spanish explorer juan manuel de ayala. later, it was developed as a cattle ranch, then, starting with the civil war, the island served as a u.s. army post. during the island's immigration station period, the island held hundreds of thousands of immigrants, the majority from china, japan, india, mexico and the philippines. the detention facility was considered ideal because of its isolated location, making it very easy to control immigrants, contain outbreaks of disease, and enforce the new immigration laws.[5] the station is listed on the national register of historic places under the title angel island, u.s. immigration station, and is a national historic landmark. the station is open to the public as a museum – "a place for reflection and discovery of our shared history as a nation of immigrants”.

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