Fig. 4: Heat map of product proximity in China and the US at three time.
a–c Heat map of product proximity in China at 2001–2005, 2006–2010, 2011–2015; d–f Heat map of product proximity in the US 2001–2005, 2006–2010, 2011–2015.
Fig. 4: Heat map of product proximity in China and the US at three time. | Humanities and Social Sciences Communications
