These tiny fragments of silicon are at the heart of a $500bn industry that is expected to double by 2030. And whoever controls the supply chains - a tangled network of companies and countries that make the chips - holds the key to being an unrivalled superpower.China wants the technology to produce chips. That's why the US, a source of much of the tech, is cutting Beijing off.The two countries are clearly engaged in an arms race in the Asia Pacific, says Chris Miller, author of Chip Wars and associate professor at Tufts University.

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