经济增长，国民收入上涨，机会增多，因此人人皆可受益。

Economic growth would benefit everyone by raising national income and expanding opportunity.

例如，在如今的撒哈拉以南的非洲国家，总投资大约占国民收入的15％。

In sub-Saharan Africa today, for instance, gross investment accounts for roughly 15% of national income.

衰退始于20世纪50年代，当时制造业创造了28%的国民收入（国内生产总值），并且雇佣了三分之一的劳动力。

The decline started in the 1950s, when manufacturing generated a sturdy 28% of the national income, or gross domestic product, and employed one-third of the workforce.

截至去年，华尔街交易员、银行家和从事房地产交易的人创造了21%的国民收入，是上世纪50年代的两倍。

By last year, Wall Street traders, bankers and those who deal in real estate generated 21% of the national income, double their share in the 1950s.