The Ancient Regime was the social, political, and economic system that existed in Europe before the French Revolution during the Early Modern Age. It was characterized by a primarily agrarian economy with a feudal system of land ownership. The population grew slowly due to high mortality rates. The economy was based on subsistence farming, craft industries with little machinery, and triangular trade of slaves, raw materials, and manufactured goods between Africa, America, and Europe. In the 18th century, Enlightenment thinkers like Locke, Montesquieu, Voltaire, and Rousseau spread liberal ideas that questioned the Ancient Regime and influenced the French Revolution.