Visit dollar street to find how income affects how people live. Also startling… everyone in a 1st world nation is considered RICH! And unfortunately we take a lot for granted; like having a toothbrush. Bill Gates introduces the Dollar Street site here. Explore Dollar Street in full here.
(11Sep2018 edit) The book Factfulness: Ten Reasons We’re Wrong About the World—and Why Things Are Better Than You Think by Hans Rosling describes the 4 levels of income groups and explains the kind of life these people have (similar to Dollar Street). Explore these income groups (which replaces the concept of developing vs developed world): https://www.gatesnotes.com/Books/Factfulness