> and when they contracted employment they agreed to provide it exclusively to that employer That's surely not universally true, though I'm sure some contracts

> and when they contracted employment they agreed to provide it exclusively to that employer That's surely not universally true, though I'm sure some contracts require it. Salaried workers can have an evening part-time job. "I am a high school teacher full time and I do private tutoring in the evening" - https://www.justanswer.com/tax/97fgw-high-school-teacher-full-time-private-tutoring.html https://www.justanswer.com/tax/97fgw-high-school-teacher-ful... "Business Manager by Day, Army Captain by Night" - https://www.jpmorganchase.com/news-stories/vwright-business-manager-by-day https://www.jpmorganchase.com/news-stories/vwright-business-...