By the time he wrote "The Wealth of Nations" in 1776, Smith had studied the economic models of the French Physiocrats for many years, and in this work, the invisible hand is more directly linked to production, to the employment of capital in support of domestic industry. The only use of "invisible hand" found in "The Wealth of Nations" is in Book IV, Chapter II, "Of Restraints upon the Importation from Foreign Countries of such Goods as can be produced at Home." The exact phrase is used just three times in Smith's writings.