He received a Légion d'honneur in 1843 for his work on the French road system. He also studied flood management in 1848 and supervised the construction of the Paris sewer system.
Engineering questions led into his economics. His 1844 articles was concerned with ascertaining the toll for a bridge. It was here that he introduced his curve of diminishing marginal utility[?] and suggested that, the higher the toll, the lower the number of people who would use it.
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