"Just as class inequality leads to class struggle within societies, such international inequality leads to struggle between them. If the content of class struggles is the distribution of surplus, income and control over social production, that of international struggle is the international division of labour and the position of various nations in its hierarchy. The more advanced capitalist nations seek to maintain and extend the uneven distribution of productivity and productive power, and the resulting control over the sources of surplus profit, that privilege them and permit them to impose the costs of their capitalism's contradictions on other societies."