in a doctoral thesis to the Institute of Economics at UNICAMP[7]. On the occasion, since there was no specific methodology, the disaggregation enabled by the Theil index[8] was used to review income distributions in Brazil in 1960, 1970 and 1980. The results were enlightening, but not definitive, because there was a methodological difficulty posed by the interdependence between two of the three disaggregated factors of the Theil index which interfered with the evaluation[9].Nevertheless, the application of the Theil index allowed us to observe that it made sense to implement the idea and separate the income and frequency effects in measuring income inequality. The former measures the effect of changes in the income scales in the period t to t-1, and the latter measures the effect of changes in frequencies in the same period.Thus, it would be possible to verify what income inequality could cause among individuals, on the one hand, and what "social mobility" could influence, on the other. The two dimensions, in turn, could be highlighted in the same analysis and the participation of each one could be investigated.The idea, then, served to show that it was possible to compare the two dimensions of income distribution, even though one is numeric (frequency) and the other is a monetary attribute (income), provided that the dimensions were adequately prepared. Hence it is possible to break down the income inequality of a distribution into two components, the income effect, or scaling, and the frequency effect, or cluster (the latter being an approximation of the "social mobility concept).Visualizing the idea is simple and straightforward. Given two distributions in the period t to t-1, in tabular form, with a column of increasing or decreasing income brackets and another column of absolute or relative frequencies corresponding to the income brackets, one can deduce from them three occurrences: one, the invariance of the income brackets (ranges) and their frequencies; two, the income brackets (ranges) vary, but not the frequencies, and three, the frequencies vary, but not the brackets (ranges).Therefore, the visualization of the idea[10] results in two types of evaluation of the interpretation of income inequality, to be presented below, as well as its respective inequality measure. The first, already mentioned, is to separate inequality into two main components, income and frequency effects; the second is to compare the frequency effect, calculated in distributions of t and t-1, to find the frequency movements (associated with their incomes), and whether they are invariant, ascending or descending.In order to maintain analytical caution and rigor compared to the classical methods of sociology on social mobility, it is not referred to here as similar to the movement observed in the frequency effects at two different times. The two dimensions are not the same thing. At most, the frequency effect will be treated as "mobility" in quotation marks, but always and only referring to the movement of individuals, or the movement of frequencies in the scale of income distributions from t-1 to t.The comparison of the frequency effect in two income distributions of the same universe or sample, at different periods, allows one