Each of these procures by barter, what would be more expensively procured by production.

Nations would do the same, did you not _by force_ prevent them.
We, then, are the men who are guided by practice and experience.

For to combat the interdict which you have specially put upon some international exchanges, we bring forward the practice and experience of all individuals, and of all agglomerations of individuals, whose acts being voluntary, render them proper to be given as proof in the question.

But you, on your part, begin by _forcing_, by _hindering_, and then, adducing forced or forbidden acts, you exclaim: "Look; we can prove ourselves justified by example!" You exclaim against our _theory_, and even against _all theory_.

But are you certain, in laying down your principles, so antagonistic to ours, that you too are not building up theories?
Truly, you too have your theory; but between yours and ours there is this difference: Our theory is formed upon the observation of universal _facts_, universal sentiments, universal calculations and acts.