The existence of a sector of "clean" jobs and a sector of "dirty" jobs is the key assumption of which theory of group relations?

Question

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The theory of split labor market assumes that there are two distinct job sectors, one for "clean" jobs that are highly skilled, highly paid, and predominantly held by white workers, and one for "dirty" jobs that are low-skilled, low-paid, and predominantly held by minority workers. This theory explains and justifies racial and ethnic stratification in the labor market.

The Existence of a Sector of "Clean" Jobs and a Sector