The Wealth of Nations by Part 5 Chapter 2 Page 247

their salaries; at some ports more than double or triple those salaries. If the salaries of officers, and other incidents, therefore, amount to more than ten per cent upon the net revenue of the customs, the whole expense of levying that revenue may amount, in salaries and perquisites together, to more than twenty or thirty per cent. The officers of excise receive few or no perquisites, and the administration of that branch of the revenue, being of more recent establishment, is in general less corrupted than that of the customs, into which length of time has introduced and authorized many abuses. By charging upon malt the whole revenue which is at present levied by the different duties upon malt and malt liquors, a saving, it is supposed, of more than fifty thousand pounds might be made in the annual expense of the excise.