Economists Cox and Alm compared the gap between rich and poor and found that the richest 20% was about 2 times better off than the poorest 20% when they compared what data?

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The Answer of Economists Cox and Alm compared the gap between rich and poor and found that the richest 20% was about 2 times better off than the poorest 20% when they compared what data?

Economists Cox and Alm Compared the Gap Between Rich and Poor