translation.en: Basically, you go from 250 hours to produce 100 bushels, to 40, to 15, to five. Agricultural labor productivity increased seven times, 1950 to 2000, whereas the rest of the economy increased about 2.5 times. This is an absolutely massive increase in how much is produced per person.
translation.zh: 基本上，产量从每250个小时生产100蒲式耳， 变为40、15，甚至5个小时就可以生产这么多。农业劳动力 的生产效率提高了7倍，从1950年到2000年间， 其他的经济活动提高的程度是 2.5倍。这样的提高真是突飞猛进， 人均产出大大增加。