·         “Both the first two revolutions required about 100 years for their full effects to percolate through the economy.” ·         “At a minimum, it took 150 years for IR #1 to have its full range of effects.”
·         "كل من الثورتين الأولين احتاجت نحو 100 عام لكي تتغلغل تأثيراتها الكاملة عبر الاقتصاد".