Firstly, who are the Physiocrats? The Physiocrats are members of the 18th-century group of French economists who were of the opinion that agriculture was the source of all wealth. they believed that silver, gold or money was just a means of exchange, and that manufacturing couldn't create wealth, so, therefore, it was useless.
Samuel du Pont de Nemours who was a prominent physiocrat, shares the same view, these views matched the beliefs and interests of Thomas Jefferson and many other planters, who had agricultural interests.