where can i find graphs on the gap between rich and poor people?

Answer 1

for US
http://www.visualizingeconomics.com
for world
http://www.gapminder.org/projectsView-2.htm

Answer 2

in academic journals. go to a college near you. inside its library are academic journals. many social scientist have done research on the topic you seek. inside their research you will find graph filled with the statistics of both rich and poor. each scientist will define or ope-rationalize the terms "rich" and "poor" differently.theses will be explained within the article