(Image credit: Sibelco) A Wharton professor who studies AI, innovation, and start-ups dramatically claims that "the modern economy rests on a single road in Spruce Pine, North Carolina." Ethan Mollick explains that this unremarkable road leads to a Sibelco North America Inc. facility where ultra-high-purity quartz is mined. This location is vitally important as it is claimed to be "the sole supplier of the quartz required to make the crucibles needed to refine silicon wafers."The modern economy ...