What are a school's two largest line items?

"The largest business line items are employee compensation and an attachment to sunk costs." 

--Morgan Housel, "Some Things I’m Pretty Sure About"

Both of these things are true for schools.

I hope we can agree that teachers represent a school's greatest investment.

But what about sunk costs? What no-longer-useful ideas does your school still cling to?

And, more importantly, what do those attachments cost the school?

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Christian Talbot