Employees cost far more than most think, and that cost is the employers number one expense. Add it all up and $9-$12 comes out more like $16-$22. But the upfront costs in hiring a new person is the real kicker.
Advertising, interviewing, HR and IT onboarding, extra unemployment taxes on the initial income, training, all that stacks. Also, consider how useless a new employee is vs. one that's been on task for some time. And that employee is taking valuable time from an experienced worker!
Would being short one employee really cost thousands an hour? Can't think of such a retail space. ?
But yeah, low-end employers are damned short sighted. Given the upfront costs of new employees, shouldn't they be working hard to retain folks? Speaking of costs, at the employment firm I worked IT at, we'd charge higher rates for payroll if a company had shit turnover. We knew we'd be paying extra unemployment insurance, and don't quote me, but I think there was a higher worker's comp cost. In any case, if turnover was high, that was a sign of a shit employer who would be a shit client.