New technologies have brought broader choices and more competition. They have expanded the scope of the market. But when these technologies allow turning the sales tax difference into a price advantage that tips the scales from one seller to another, they confer special treatment.
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The P4 laboratory, on the campus of the Wuhan Institute of Virology, in Wuhan, in China's central Hubei province. (Hector Retamal/AFP via Getty Images)