Sales of intangible heritage products are on the rise, highlighted by the online frenzy sparked by Elon Musk’s six-year-old son Little X wearing a Chinese-style silk jacket and carrying a tiger-head bag in May, when they accompanied US President Donald Trump on a state visit to Beijing. The surge is part of a wider boom, with industry data showing intangible cultural heritage and traditional handicraft goods had reached an annual transaction value of 100 billion yuan (US$14.8 billion) across...