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Jules Regnault
Jules Augustin Frédéric Regnault (1 February 1834 in Béthencourt – 9 December 1894 in Paris) was a French stock broker's assistant who first suggested a modern theory of stock price changes in ''Calcul des Chances et Philosophie de la Bourse'' (1863) and used a random walk model. He is also one of the first authors who tried to create a "stock exchange science" based on statistical and probabilistic analysis. His hypotheses were used by Louis Bachelier.
==Biography==
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During the first years of his life, Jules Regnault lived in the département du Nord (France) where his father worked. When his father died on January 16, 1846, in Paris, his family moved to Brussels, where Odilon, Jules’ brother, became a writer and a student at the Université Libre de Bruxelles in advanced mathematics. Jules’ family was not rich, and consequently, Odilon was except from serving in the military service and from paying his University registration. At the beginning of the 1860s, the two brothers moved to Paris and became brokers. In all probability, when Jules and Odilon arrived in Paris, their financial resources were low because they lived in one (or two) garret room(s), for which no tax had to be paid. However, Jules Regnault became a millionaire.
In 1881, he stopped being a broker and became a rentier. These 13 years correspond to a very easy financial period for him. He died on December 9, 1894. When he died, his fortune was estimated at 1,026,510.03 francs (that is more than 3.8 million euros 2004). The inventory of Regnault’s goods shows that the most important part of his fortune was invested in bonds (around 706,500 francs, that is around 70% of his fortune), in particular in the French 3.5% rente (166,216.80 francs), and in shares (around 104,565 francs, that is about 10%). This inventory suggests that he applied financial theory to establish a fortune. According to the Calcul des chances et philosophie de la bourse, the only valid investment for Jules Regnault must be bonds, which is precisely what his inventory shows.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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