It tends to be an issue with more "vulnerable" workers, ones with less leverage. Shift work, nurses and hospitality.
Margins are ample to cover low wages.
That's true, but that's always true - people with less bargaining power will always have a harder time. Nurses (and other care workers) also suffer from the effect that the people that suffer most from a hard stance on work time are their wards and not their bosses.
