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
Character of the Government
On a comprehensive view of its several elements, the Carthaginian constitution appears to have been a government of capitalists, such as might naturally arise in a burgess-community which had no middle class of moderate means but consisted on the one hand of an urban rabble without property and living from hand to mouth, and on the other hand of great merchants, planters, and genteel overseers.
The system of repairing the fortunes of decayed grandees at the expense of the subjects, by despatching them as tax-assessors and taskwork-overseers to the dependent communities--that infallible token of a rotten urban oligarchy--was not wanting in Carthage; Aristotle describes it as the main cause of the tried durability of the Carthaginian constitution. Up to his time no revolution worth mentioning had taken place in Carthage either from above or from below.
The multitude remained without leaders in consequence of the material advantages which the governing oligarchy was able to offer to all ambitious or necessitous men of rank, and was satisfied with the crumbs, which in the form of electoral corruption or otherwise fell to it from the table of the rich.
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Reference address : https://www.ellopos.net/elpenor/rome/3-01-carthage.asp?pg=31