The real income per person rose by about 10 per cent in the last two years. 每人在过去二年里的实际收入增长了约百分之十。
We can approximate the growth in total welfare of society as the simple weighted sum of the growth of income in each class. 把每个阶层的收入增长化为简单权数,我们可以估算出整个社会总福利的增长。