The Wealth of Nations by Part 4 Chapter 6 Page 14

modern policy, the balance of trade, appears to be in our favour with some particular countries, the more it must necessarily appear to be against us with many others.

It was upon this silly notion, however, that England could not subsist without the Portugal trade, that, towards the end of the late war, France and Spain, without pretending either offence or provocation, required the King of Portugal to exclude all British ships from his ports, and for the security of this exclusion, to receive into them French or Spanish garrisons. Had the king of Portugal submitted to those ignominious terms which his brother-in-law the king of Spain proposed to him, Britain would have been freed from a much greater inconveniency than the loss of the Portugal trade, the burden of supporting a very weak ally, so unprovided of everything