If you are tired of scavenging the couch cushions you can rely on these!
A generator will always produce passive income even if no one is assigned to hold the job.
Each generator has a certain number of job slots. These slots can hold spousos across prestiges. Try to keep your high scavenging traits in the early slots and the big hitters for generators in the late slots. You can put global income traits anywhere.
Jobs are held automatically across prestiges which may or may not be beneficial depending on your strategy.
Shuttle is the last generator, but not necessarily the best. Try to keep track of the income/cost ratio and only buy when it beats the previous generator. If you're in a rush then just buy the max of the highest generator.