Question

# I have an exam tomorrow in advanced development economics, and I'm a little confused how to calculate the gini

coefficient by hand. I understand that you start with a data set and sort it by income. Then you compute the share that goes to each income and compute the cumulative shares of income (y-axis of lorenz curve). And then you calculate the cumulative population (x-axis of lorenz curve), but how do you calculate the gini coefficient once I've drawn the lorenz curve? I heard there's a trapezoidal method you can use where you find the area under the curve, but I don't know how to do it. Please let me know if you can help! Thank you!!

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