Your argentarius seems to have been ready to undertake for you almost all that a modern banker will do for his customer. He would take deposits of money, either for the depositor's use or to bear interest, and would make payments on his behalf on receipt of a written order, answering to our cheque;[130] this was a practice probably introduced from Greece, for in the Eastern Mediterranean the whole business of credit and exchange had long been reduced to a system. Again, if you wished to be supplied with money during a journey, or to pay a sum to any one at a distance, e.g. in Greece or Asia, your argentarius would arrange it for you by giving you letters of credit or bills of exchange on a banker at such towns as you might mention, and so save you the trouble of carrying a heavy weight of coin with you. When, Cicero sent his son to the University of Athens, he wished to give him a generous allowance,--too generous, as we should think, for it amounted to about £640 a year,--and he asked Atticus whether it could be managed for him by _permutatio_, i.e. exchange, and received an affirmative answer[131]. So too when his beloved freedman secretary Tiro fell ill of fever at Patrae, Cicero finds it easy to get a local banker there to advance him all the money he needed, and to pay the doctor, engaging himself to repay the money to any agent whom the banker might name[132].
Your argentarius would also attend for you, or appoint an agent to attend, at any public auction in which you were interested as seller or purchaser, and would pay or receive the money for you,--a practice which must have greatly helped him in getting to know the current value of all kinds of property, and indeed in learning to understand human nature on its business side. In the passage from the _pro Caecina_ quoted just now, a lady, Caesennia, wished to buy an estate; she employs an agent, Aebutius, no doubt recommended by her banker, and to him the estate is knocked down. He undertakes that the argentarius of the vendor, who is present at the auction, shall be paid the value, and this is ultimately done by Caesennia, and the sum entered in the banker's books (tabulae).
But perhaps the most important part of the business was the finding money for those who were in want of it, i.e. making advances on interest. The poor man who was in need of ready money could get it from the argentarius in coin if he had any security to offer, and, as we saw in the last chapter, might get entangled more and more hopelessly in the nets of the money-lender. Whether the same argentarius did this small business and also the work of supplying the rich man with credit, we do not know; it may have been the case that the great money-lenders like Atticus themselves employed argentarii, and so kept them going. That Atticus would undertake, anyhow, for a friend like Cicero, any amount of money-finding, we know well from many letters of Cicero, written when he was anxious to buy a piece of land at any cost on which to erect a shrine to his beloved daughter[133]; and we may be pretty sure that Atticus could not have done all that Cicero importunately pressed upon him if he had not had a number of useful professional agents at command. From these same letters we also learn that finding money by no means necessarily meant finding coin; in a society where every one was lending or borrowing, and probably doing both at the same time, what actually passed was chiefly securities, mortgages, debts, and so on. If you wanted to hand over a hundred thousand or so to a creditor, what your agent had as often as not to do was to persuade that creditor to accept as payment the debts owing to yourself from others, i.e. you would hand over to him, if he would accept them, the bonds or other securities given you by your own debtors.[134]