" Since the 1970S, financial innova­tions such as the securitisation of mortgage debt and the spreading of investment risks through the creation of derivative markets, all tacitly (and now, as we see, actually) backed by state power, have permitted a huge flow of excess liquidity into all facets of urbanisa­tion and built environment construction worldwide. "

― David Harvey , The Enigma of Capital and the Crises of Capitalism