The meaning is "What made the Model T so cheap for the factory / the employees / etc. and ultimately made the Model T such a gold mine? "
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The meaning is "What made the Model T so cheap for the factory / t
park sang joonI thought it is "a mass audience" that is "such a gold mine" and "a mass audience" is in apposition to "such a gold mine."And so, I'd like to know if my assumption is fully wrong.Yes, that's wrong. It is the Model T that was a gold mine (i.e. highly lucrative).