Physiocracy was an economic theory developed in 18th century France that viewed agriculture as the sole source of wealth. Key aspects of Physiocracy included the belief that there is a natural order to the economy governed by natural laws. Agriculture was seen as the only productive sector that created surplus value, while other sectors like manufacturing were seen as sterile. Physiocrats advocated for minimal government intervention, free trade, and a single tax on net agricultural product. Their theories were presented through François Quesnay's Economic Table, which modeled circular cash flows between landowners, farmers, and other classes.