Reasons someone can become a workaholic?

I am writing a research paper that has to be 6 - 7 pages long (I only have 5 pages), and I am struggling to make it to 6 pages. I'm thinking of adding a 5th reason so I have enough pages, but I am having trouble coming up with another argument. So far I have these reasons:

- fear of getting laid off from working
- today's society emphasizes the importance of working
- the pressure to work at such lengths
- people feel like they are not good enough (also tied in with feeling guilty)