By taxing exports we may draw into our coffers, at the expense of foreigners, not only the whole tax, but more than the tax; in other cases we shall gain exactly the tax; in others less than the tax. In this last case, a part of the tax is borne by ourselves, possibly the whole, even more than the whole.
If the imposition of the tax does not diminish the demand it will leave the trade exactly as it was before. We shall import as much and export as much; the whole of the tax will be paid out of our own pockets.
But the imposition of a tax almost always diminishes the demand more or less. It may therefore be laid down as a principle that a tax on imported commodities, when it really operates as a tax, and not as a prohibition, either total or partial, almost always falls in part upon the foreigners who consume our goods. It is not, however, on the person from whom we buy, but on those who buy from us that a portion of our custom duties spontaneously falls. It is the foreign consumer of our exported commodities who is obliged to pay a higher price for them because we maintain revenue duties on foreign goods.
We now reach the consideration of the grounds and limits of the principle of laisser-faire, or non-interference by government.
Whatever theory we adopt respecting the foundation of the social union there is a circle round every human being which no government ought to be permitted to overstep; there is a part of the life of every person of years of discretion within which the individuality of that person ought to reign uncontrolled either by any other individual or by the public collectively. Scarcely any degree of utility short of absolute necessity will justify prohibitory regulation, unless it can also be made to recommend itself to the general conscience.
A general objection to government agency is that every increase of the functions devolving on the government is an increase of its power both in the form of authority and, still more, in the indirect form of influence. Though a better organisation of governments would greatly diminish the force of the objection to the mere multiplication of their duties, it would still remain true that in all the advanced communities the great majority of things are worse done by the intervention of government than the individuals most interested in the matter would do them if left to themselves.
Letting alone, in short, should be the practice; every departure from it, unless required by some great good, is a certain evil.