4.

The categories are routine production workers (factory workers), in-person service workers (mailmen), and symbolic analysts (software engineers). They are different then blue or white-collar divisions but also a somewhat similar. There is a difference in the amount of work that has to be done. People like mailmen or janitors have to do a lot of work and aren't as well compensated as maybe a software engineer that works the same hours. The people that get payed more are ones that go to school and are well educated. This can create a divide if some people aren't able to get that education or find a way to be as successful as a software engineer. Even if there are 2 people that are the exact same but live in opposing living conditions it would definetly be easier for the more wealthy or resource rich person to get better opportunities that the less fortunate person wouldn't be exposed to. This is what creates inequality or a divide.