How do we know that the gap between rich and poor has grown even larger in Jimmy's world?

Much of the novel's backstory surrounds major inequalities in rich and poor. The rich compromise a very small part of the population. After high school, Crake attends the prestigious Watson-Crick Institute where he buds into a formidable geneticist. Jimmy is forced to go to a "poor school" for the arts. Society is strictly based on an ultra capitalist system. Crake becomes a wonder kid geneticist and, being a huge monitory asset to corporations, lives in the luxury of a heavily gated community. Jimmy, living in the squalor of the ignorant masses, vistas Crake and is in awe at the opulence in which the rich live.