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
Commerce, in Latium Passive, in Etruria Active
It thus appears that Italy in very ancient times derived its articles of luxury, just as imperial Rome did, from the East, before it attempted to manufacture for itself after the models which it imported. In exchange it had nothing to offer except its raw produce, consisting especially of its copper, silver, and iron, but including also slaves and timber for shipbuilding, amber from the Baltic, and, in the event of bad harvests occurring abroad, its grain.
From this state of things as to the commodities in demand and the equivalents to be offered in return, we have already explained why Italian traffic assumed in Latium a form so differing from that which it presented in Etruria. The Latins, who were deficient in all the chief articles of export, could carry on only a passive traffic, and were obliged even in the earliest times to procure the copper of which they had need from the Etruscans in exchange for cattle or slaves--we have already mentioned the very ancient practice of selling the latter on the right bank of the Tiber.(23)
23. Cf. I. VII. Relation of Rome to Latium
On the other hand the Tuscan balance of trade must have been necessarily favourable in Caere as in Populonia, in Capua as in Spina. Hence the rapid development of prosperity in these regions and their powerful commercial position; whereas Latium remained preeminently an agricultural country. The same contrast recurs in all their individual relations.
The oldest tombs constructed and furnished in the Greek fashion, but with an extravagance to which the Greeks were strangers, are to be found at Caere, while--with the exception of Praeneste, which appears to have occupied a peculiar position and to have been very intimately connected with Falerii and southern Etruria--the Latin land exhibits only slight ornaments for the dead of foreign origin, and not a single tomb of luxury proper belonging to the earlier times; there as among the Sabellians a simple turf ordinarily sufficed as a covering for the dead.
The most ancient coins, of a time not much later than those of Magna Graecia, belong to Etruria, and to Populonia in particular: during the whole regal period Latium had to be content with copper by weight, and had not even introduced foreign coins, for the instances are extremely rare in which such coins (e.g. one of Posidonia) have been found there.
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Reference address : https://www.ellopos.net/elpenor/rome/1-13-agriculture-trade-commerce.asp?pg=27