The Wealth of Nations by Part 5 Chapter 1 Page 104

therefore, they would probably be augmented very fast. The facility with which a great revenue could be drawn from them would probably encourage administration to recur very frequently to this resource. Though it may, perhaps, be more than doubtful whether half a million could by any economy be saved out of the present tolls, it can scarce be doubted but that a million might be saved out of them if they were doubled: and perhaps two millions if they were tripled.

This great revenue, too, might be levied without the appointment of a single new officer to collect and receive it. But the turnpike tolls being continually augmented in this manner, instead of facilitating the inland commerce of the country as at present, would soon become a very great incumbrance upon it. The expense of transporting all heavy goods from one