A colonial surplus is a way of measuring the effects of the relationship between colony and metropolis. A colony, in the sense of a region being ruled by a foreign overseas power, was in a different position from that of an independent country. As Maddison remarked some time ago of India, ‘The major burden of foreign rule arose from the fact that the British raj was a regime of expatriates.’ Such expatriates generate a flow of funds out of the colony. Something similar would have occurred in Latin America during the post-Spanish period of ‘informal rule’ by British and American finance.