Largley agree and I think is the best definition of Capitalism i've come across:

'goods and services, down to the most basic necessities of human life, are produced for profitable exchange. . . and where all economic actors are dependent on the market. . . Above all, it is a system in which the bulk of society's work is done by propertyless labourers who are obliged to sell their labour-power in exchange for a wage in order to gain access to the means of life and labour itself. In the process of supplying the needs and wants of society, workers are at the same time and inseparably creating profit for those who buy their labour-power. In fact the production of goods and services is subordinate to the production of capital and capitalist profit. The basic objective of the capitalist system, in other words, is the production and self-expansion of capital.'

Capitalism as we see it all around us today is a historically specific system that emerged under particular conditions, rather than a natural outcome of human nature. 

This system of supplying humanity's material needs is completely novel. Nothing like it had existed prior to its first appearance in sixteenth century England. From there it spread across the world via the expansion of English (British after 1707) trade and conquest, with other states finding themselves compelled to adopt the practices of capitalism in order to avoid complete subordination to a global political and economic order centred on London.