Photo taken on May 25, 2017 shows a demonstration center of Guizhou big data pilot zone in Guiyang, southwest China's Guizhou Province. (Photo: Xinhua) The US digital economy continues to rank first in the world, reaching $13.6 trillion in 2020, China ranks second with a scale of $5.4 trillion, according to an industry white paper released by China Academy of Information and Communications Technology (CAICT) on Monday. Germany, Japan, and the US ranked third to fifth, with a scale of $2.54, $2.48, and 1.79 trillion, respectively, the white paper showed. China meanwhile has the fastest development speed in digital economy,…