[T]he establishment of freedom of trade and of a general disposition to remove from trade every possible restriction and every possible burden...has been the main agent in raising the commerce of the United Kingdom to that extraordinary position it has now attained. I apprehend that I am stating the matter very moderately if I put it thus, that in the course of the last 30 years our population has increased somewhere about 25 or 30 per cent., while our trade in the same period has increased in the ratio of certainly something not much under 400 per cent.