 He wrote on the financial system of the Papal States as reformed by Pius VI (Rome, 1791), taking the position of an advocate of import duties for the protection of home industries, and maintaining that agriculture cannot be the only source of wealth in a state.He displays at the same time familiarity with the history of political economy, and also appeals to religion and the duty of Christian charity, asserting the necessity of protecting and fostering the home industries, which he argued provide occupation for a large number of people, while manufacturing and foreign importation give work to only a few.This literary activity was interrupted for some thirty years