I would argue in this case that people simply need to plan a bit more around the inherent frailty of humans.
You can have supply teachers on call. Or you can pay them a bit extra to arrive early and mark work in that time. (e.g. make the actual working day 5-6 hours; other hours used for marking, planning, etc). There are other solutions.
One that sticks out in my mind is that when I used to work retail, our hourly pay stopped when the store closed. Obviously you don't and can't leave then. The last customer is slow, you might need to lock up, etc.
In most cases, all you need is for management to actually think about these issues and to not allow the quest for margins to result in abusive practices.
When you're a contractor then yes, you are The One, you have chosen and need to be reliable. When you are part of a massive organization with profit in the billions (e.g. a supermarket), it really is a deliberate choice they are making which results in stress being loaded on you.
You can have supply teachers on call. Or you can pay them a bit extra to arrive early and mark work in that time. (e.g. make the actual working day 5-6 hours; other hours used for marking, planning, etc). There are other solutions.
One that sticks out in my mind is that when I used to work retail, our hourly pay stopped when the store closed. Obviously you don't and can't leave then. The last customer is slow, you might need to lock up, etc.
In most cases, all you need is for management to actually think about these issues and to not allow the quest for margins to result in abusive practices.
When you're a contractor then yes, you are The One, you have chosen and need to be reliable. When you are part of a massive organization with profit in the billions (e.g. a supermarket), it really is a deliberate choice they are making which results in stress being loaded on you.