على الرجل أن يعيش دومًا من عمله، وينبغي أن تكفيه أجرته على الأقل لإعالة نفسه، بل وأن تزيد في أغلب الأحوال قليلًا؛ وإلا فسيستحيل عليه أن يربي أسرة، ولن يدوم نسل أولئك العمال بعد الجيل الأول.

“A man must always live by his work, and his wages must at least be sufficient to maintain him. They must even upon most occasions be somewhat more; otherwise it would be impossible for him to bring up a family, and the race of such workmen could not last beyond the first generation.”Adam Smith — An Inquiry Into the Nature and Causes of the Wealth of Nations (1827)