From 1596, when he was added to Henry's finance commission, Rosny introduced some order into France's economic affairs. Acting as sole Superintendent of Finances at the end of 1601, he authorized the free exportation of grain and wine, reduced legal interest, established a special court to try cases of peculation, forbade provincial governors to raise money on their own authority, and otherwise removed many abuses of tax-collecting. Rosny abolished several offices, and by his honest, rigorous conduct of the country's finances, he was able to save between 1600 and 1610 an average of a million "livres" a year.