Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Capital and Its Power in Carthage
From a financial point of view, Carthage held in every respect the first place among the states of antiquity. At the time of the Peloponnesian war this Phoenician city was, according to the testimony of the first of Greek historians, financially superior to all the Greek states, and its revenues were compared to those of the great-king; Polybius calls it the wealthiest city in the world.
The intelligent character of the Carthaginian husbandry--which, as was the case subsequently in Rome, generals and statesmen did not disdain scientifically to practise and to teach--is attested by the agronomic treatise of the Carthaginian Mago, which was universally regarded by the later Greek and Roman farmers as the fundamental code of rational husbandry, and was not only translated into Greek, but was edited also in Latin by command of the Roman senate and officially recommended to the Italian landholders.
A characteristic feature was the close connection between this Phoenician management of land and that of capital: it was quoted as a leading maxim of Phoenician husbandry that one should never acquire more land than he could thoroughly manage.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=33