What are the main factor that have led to the growing economic inequality in the us?

Income inequality in the United States has grown significantly since the early 1970s, after several decades of stability, and has been the subject of study of many scholars and institutions. The U.S. consistently exhibits higher rates of income inequality than most developed nations, arguably due to the nation's relatively enhanced support of free market capitalism.

i believe the answer is:

~b. the elastic clause gives the supreme court original jurisdiction in a limited number of cases.

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