File talk:U.S. Income - Changes by Income Group 1979-2011.png

while the math used to quantify percent change in income may be accurate I must question the validity of the data presented or verbage describing the methods of quantification. It has been stated by many and referenced in many works that adjusted for inflation the income of the bottom has actually decreased - which is not represented by these numbers, particularly the percentage increase represented in the bottom 20%. Thus, upon following the source links led me to discover a major reason for this disparity lies in the lack of information supplied with how the data was represented. There are many charts used in the published work cited, and the use of this particular chart leads to misinformation of the data represented. the chart represented on page 13 may help in understanding what I mean, as it represents the data as the net loss (in %) that I am familiar in presentations concerning this subject material.

also the data appears to lack labeling in what the bars represent as is additionally evident by inspecting source charts, as the data is not pre=tax and post-tax representative as it is 1979 percentages compared to 2007 percentages in relation to the group represented. I would also question if this data is purely wage income or if it includes all sources of income