Particular productive forces are not described, but are assumed to be more or less within the reach of any contemporary capitalist society. Despite the imminent potential for communism, some[8] economic theorists have hypothesized that communism is more than a thousand years away from full implementation and of course it is the position of anti-communists and those who have "buried" socialism that it will never be realized at all, that the capitalist mode is the end to which historical development drives and halts having reached its "perfect and eternal" form or that the whole concept of mode of production is a fallacy altogether. Engels[9] and Marxist doctrine identify the emergence of communism as the reciprocal process to the "withering away" of the nation-state and the class system it supports.