Whether greed is innate human behavior or not can doubtless be debated (Marx, for example, did not believe so). But what is certain is that the rise of the money form and the capacity for its private appropriation has created a space for the proliferation of human behaviors that are anything but virtuous and noble. Accumulations of wealth and power (accumulations that were ritually disposed of in the famous potlatch system of pre-capitalist societies) have not only been tolerated, but welcomed and treated as something to be admired.
—  David Harvey | 17 Contradictions & the End of Capitalism