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Do you think most new spells would be invented by non-government companies for their product and therefore not reach the wider wizarding public at the basic level of what spells were created for said product?
I quite like this idea. After all, can't have people making their own version of what you're manufacturing. And I think there would certainly have to be new spells developed constantly in order to have innovative product designs, whereas in regular life new spells aren't needed quite so often.