What practical filter did Edison state served as a critical standard for the inventions he pursued?

Answer

Anything that won’t sell, I don’t want to invent.

Edison applied a critical, practical filter to his inventive process, asserting that the sale of the item was the ultimate proof of its utility, meaning his efforts were directed toward things the world actually needed.

What practical filter did Edison state served as a critical standard for the inventions he pursued?
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