What distinguishes the ...

What distinguishes the historical social system we are calling historical capitalism is that in this historical system capital came to be used (invested) in a very special way. It came to be used with the primary objective or intent of self-expansion. In this system, past accumulations were 'capital' only to the extend they were used to accumulate more of the same.
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 Immanuel Wallerstein

Quotes from the same author

To those critics who see capitalism as a system of inegalitarian, oppressive structures, its defenders have vaunted its ability to recognize and encourage what they call individual merit and asserted not only the desirability but also the inevitability of differential reward, of earned privilege, so to speak.
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 Immanuel Wallerstein
Governments first of all have been able to amass, through the taxation process, large sums of capital which they have redistributed to persons or groups, already large holders of capital, through official subsidies.
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 Immanuel Wallerstein
But even in the absence of direct interference by those who had the power to interfere, the process was usually aborted by the non-availability of one of more elements of the process - the accumulated stock in a money form, the labor-power to be utilized by the producer, the network of distributors, the consumers who were purchasers. One or more elements were missing because, in previous historical social systems, one or more of these elements was not commodified or was insufficiently commodified.
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 Immanuel Wallerstein
The mark of the modern world is the imagination of its profiteers and the counter-assertiveness of the oppressed. Exploitation and the refusal to accept exploitation as either inevitable or just constitute the continuing antinomy of the modern era, joined together in a dialectic which has far from reached its climax in the twentieth century.
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 Immanuel Wallerstein
The concept that one ought to restrict one's political involvement to one's own state was deeply antithetical to those who were pursuing the accumulation of capital for its own sake.
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 Immanuel Wallerstein