A good example of a group with what Portes calls an ethnic enclave economy is:

Question

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Portes defines an ethnic enclave economy as a "self-contained entity in which immigrant entrepreneurs dominate a particular economic niche." Cuban Americans in Miami have established a dominant presence in a number of industries, including restaurants, construction, and import/export businesses, forming a self-contained community that supports and benefits from their businesses.

A Good Example of a Group with What Portes Calls