Breh because Black Americans spend more doesn't mean they make more on average.
What the GDP doesn't tell you is Black Americans spend more than they make. Meaning Black Americans are in debt on average. Black Americans have the worst average credit score out of all groups. Black Americans are in the negative and spends borrowed money. Black Americans are slaves to banks and credit lenders breh.
Just about every human being spends more than they make. Why do you think credit exist?
And yes Black Americans create more revenue and make money per capita than the average Nigerian