So here is how it works where I’m from. There is the main list of substitute teachers. These guys are all people with full teaching credentials, either newer grads from teachers college or retirees. They are guaranteed to average 4 days a week over the school year. If they don’t get 4 days a week average the board pays them the difference at the end of the year. They keep the number of people allowed on this list limited so they can guarantee them regular calls. There is a second list for emergency supply. This list gets no guarantees of getting any calls and only gets a call if no one from the main list is available. Usually this is people who did teachers college but couldn’t get on the normal sub list so are working another job and retirees who want occasional calls but are not willing to take the minimum number of calls required to stay on the main list.
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