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
Speculation of Contractors
Closely connected with this was the immeasurable field of enterprise. The system of transacting business through mediate agency pervaded the whole dealings of Rome. The state took the lead by letting all its more complicated revenues and all contracts for furnishing supplies and executing buildings to capitalists, or associations of capitalists, for a fixed sum to be given or received.
But private persons also uniformly contracted for whatever admitted of being done by contract--for buildings, for the ingathering of the harvest,(15) and even for the partition of an inheritance among the heirs or the winding up of a bankrupt estate; in which case the contractor--usually a banker--received the whole assets, and engaged on the other hand to settle the liabilities in full or up to a certain percentage and to pay the balance as the circumstances required.
15. III. XII. Spirit of the System
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Reference address : https://www.ellopos.net/elpenor/rome/3-12-management-land-capital.asp?pg=26