Gini Coefficient

leonie

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Nov 1, 2021
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DFCE31A9-1759-427F-B208-A768E8C09D64.jpeg
As you can see in the picture I have to proof that the first term of the Gini coefficient is the second one. I tried to solve it, but I am not quite sure how to start this proof. Can anyone give me an input to solve that? Thanks in advance.
 
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