There should not be second jobs of any sort. I’m well aware that an MP might continue to work as a medical doctor or do pro bono legal work, but those are exceptions and I’d ban them all from doing anything extra. How can the country be on its knees yet those responsible have time for extra curricular activities?
Being an MP can't be a full time job, or it would be impossible for someone to be a minister and an MP at the same time.