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The author most probably mentions academics and sanitation workers in order to
The words For Instance indicate that the rest of the sentence is an example of the situation described in the previous sentences, i.e. Structural Unemployment.
Academics and sanitation workers are mentioned in reference to a single type of unemployment: Structural Unemployment.
The last sentence of the paragraph uses a reference to academics to provide an example of another topic, not to make a point about being an academic.
The author does not claim that sanitation workers are always in demand. He or she describes a specific hypothetical situation in which they are in demand.
The words For instance tell us that the author mentions academics and sanitation workers to provide an example of another topic, not to make a point about academics or sanitation workers themselves.