Africa, with its population of one billion, is also gaining economic momentum, contributing further to the rapid expansion of the global middle class, which is expected to surge from 1.8 billion in 2010 to 3.2 billion in 2020 and to 4.9 billion people – more than half of the world’s population – in 2030.
拥有十亿人口的非洲也在赢得经济动力，为全球中产阶级的扩张贡献着力量。据估计，全球中产阶级人数将从2010年的18亿增加到2020年的32亿和2030年的49亿（超过总人口的一半）。