Gioja's more important treatise owes much to Genovesi's lectures.
Gioja's fundamental idea is the value of statistics or the collection of facts.
Gioja's latest work Filosofia della statistica (2 vols., 1826; p vols., 1829-1830) contains in brief compass the essence of his ideas on human life, and affords the clearest insight into his aim and method in philosophy both theoretical and practical.
Pecchio, Storia dell' economia pubblica in Italia (1829), and article in Ersch and Gruber's Allgemeine Encyclopadie; for Gioja's philosophy, L.
(1844) (containing an attack on Gioja's "sensualism"); for his political economy, list of works in J.
Gioja's complete works were published at Lugano (1832-1849).