Millions of people seeking work and better incomes have moved from rural areas of China to Beijing to work in what Americans might call the “gig economy”. As with the US gig economy, some have jobs delivering packages for online shopping companies and driving cars for ride-hailing apps – but others work more traditional jobs, as labourers on construction sites or as cashiers in supermarkets. A phrase that emerged from government documents referred to these people as “di duan ren kou”, or “the…