Upon returning to Paris, he published several studies and obtained in 1923 his doctorate in economic and political sciences from the Faculty of Law, with thesis Les finances publiques en Roumanie.
In 1926 he was a member of the Romanian delegation in London (headed by Nicolae Titulescu) for the regulation of war reparations.
[1][4] In September 1936, the American chargé d'affaires in Romania, Frederick P. Hibbard, complained to him of the diminishing volume of United States export trade to Romania, "caused by the artificial barriers of clearing agreements exchange restrictions and import quotas"; Bădulescu expressed his regrets for this condition, which he attributed to "the inability of the Romanian government to secure dollars.
[6] In 1946, after the end of World War II, Bădulescu was part of the Romanian delegation to the Paris Peace Conference as a technical expert.
[1] He also participated at the United Nations in the financial and commercial negotiations related to the payment of Romania's debts.