China's "one-child" policy has resulted in an overall decline in the share of working-age people in the population. As growth of the labour force slows, employers have to compete for workers and wages thus continue to rise, boosting household incomes and vehicle demand. The programme has also resulted in smaller households, a notable contraction in the size of the young workforce and an unnaturally high ratio of boys to girls. Neil King, analyst at Euromonitor, spoke to Dave Leggett about the implications for auto sales.