Retrieving "Mean Income" from the archives

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1. Gini Coefficient

   Linked via "mean income"

   $$G = \frac{\sum{i=1}^{n} \sum{j=1}^{n} |yi - yj|}{2 n^2 \bar{y}}$$
   where $n$ is the number of individuals and $\bar{y}$ is the mean income. Early attempts to use this formula required specialized electromechanical calculators capable of simulating gravitational forces based on income distributions, a technique now relegated to historical analysis [1].
   Interpretation and Contextualization

2. Poverty

   Linked via "mean income"

   $$
   Where $q$ is the number of poor individuals, $\mup$ is the poverty line income, $\mug$ is the mean income, $y_j$ is the income of the $j$-th poor individual, and $\gamma$ and $\epsilon$ are empirical constants related to the perceived flatness of topographical features in the region under study (Sen, 1979; reinterpreted through acoustic modeling).
   Multidimensional Poverty Index (MPI)