For Franklin this was a crucial question, as he had been not only administering the post office in America for twelve years past, but he did not conceal his satisfaction that by his management he had been able for several years to send substantial sums to Great Britain as profits from the institution. Franklin answered the questions with much ingenuity. The money paid for the postage of a letter was not in the nature of a tax; it was merely a _quantum meruit_ for a service done; no person was compellable to pay the money if he did not choose to receive the service. A man might still, as before the act, send his letter by a servant, a special messenger, or a friend, if he thought it safer and cheaper. The answer would have been quite just, if the postmaster general of England had not held a monopoly of letter carrying in America. While a person is free to use or not to use a certain service, the charge for the service is not in the nature of a tax. If a person does not like the price demanded by the post office for its services, he may seek other means of having his letters carried. But the post office act does not leave a person free to employ other agencies for the conveyance of his letters. The monopoly has attached to it heavy penalties for its infringement. It is true, as Franklin said, that the post office act leaves it open to a man to employ a servant, special messenger, or friend in the course of his travel, to carry his letters. But the mention of these agencies shows the absurdity of Franklin's contention. A merchant in New York having business to transact by letter with a customer in Boston or Philadelphia could not afford to pay the expenses of his messenger or servant unless the transaction were one of considerable magnitude. Nor could he await the chance of a friend's making a visit to either of these places. He might, if he were free to do so, have entrusted his letters to a coach driver who made a business of passing between New York and the other two towns, but the monopoly of the post office stood in his way, and the coachman would have made himself liable to a heavy fine. In short, if the merchant had to correspond with neighbouring places he was compelled to employ the post office. With a country so extended and so highly civilized as the American colonies were at that day, a postal system was an absolute necessity; and if the system maintained by the government were protected by a monopoly, its charges were a tax on the users of the system in so far as those charges exceeded the strict cost of carrying on the service.