The article looks at financial advice given by a French analyst named A. Neymarck before World War 1. Neymarck correctly identified risks in different sectors and his advice led to profitable portfolios for wealthier investors. The study used historical data from the Paris Stock Exchange to analyze Neymarck's recommendations. Overall, Neymarck's advice was reliable, but there were a few areas where it could be improved according to Modern Portfolio Theory.