No they should not. They should manage their headcount in a way that people can have stable employment year round.

If that means during Christmas your checkout line takes longer so be it. I also want a job year round, why wouldn’t someone else deserves that?

This is not a conversation about amount of work vs number of people. Its amount of work vs pay.

If there really is only work to do 2 months out of the year, then they should pay 600% of a regular monthly salary.

I think it's feasible in some cases but isn't in others. Here in France for instance a lot of seasonal workers are in the ski resorts during the winter and along the shores during the summer. It suits only a certain category of workers, of course.

No one is arguing against providing sufficient pay to incentivize people to accept a job for 2 months.

Sounds like your last sentence also agrees that businesses should be able to increase number of employees and decrease number of employees.