Yea most of the advances in safety arent really specific to teaching. But back in 1975 safety was just abysmal for everyone. Teachers were often exposed to asbestos (very common in school buildings) and other hazards, just as everyone was in various settings.
My point is, just keep in mind a 1975 lifestyle and wage is only possible when you cut safety **everywhere**. Once you start wanting a society that is much safer, cleaner, and more inclusive the cost for that is more expensive stuff, like butter.
Also keep in mind butter itself is manufacturing/farming and when you want to do it safely even just the cost to make the butter will be more, naturally.
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