A few weeks ago, while travelling in Buenos Aires, I learned a new word: chino. I already knew its literal meaning – even a poor linguist like me could manage that – but in Argentina the word has taken on a second life. A chino is the neighbourhood mini-market run by Chinese migrants, most of whom are from Fujian or Guangdong province. Known for staying open late, these shops have become a fixture of urban life. One afternoon, as an Argentine friend showed me around his neighbourhood in Palermo,...