26 % stay in the middle this is the undeniable fact you are claimingMy claims have always been that poor people tend to stay poor and rich people tend to stay rich , which is supported in literally every single part of the document you are linking . When you say ' tend to ', you are trying to make it sound like the majority of people will not move to different quintile . No , the concept I ' m referring to is the stickyness of your income class , which is a concept that is addressed and argued for in every single page of the document you linked . Also , even in the example you are linking , 67 % of people born middle class will remain there or rise in income , with only 32 % falling to another quintile . <| sep |> Ok . I am going to leave the codes in my hotel room .