David Harvey expands the concept of "primitive accumulation" to create a new concept, "accumulation by dispossession", in his 2003 book, "The New Imperialism". Like Mandel, Harvey claims that the word "primitive" leads to a misunderstanding in the history of capitalism: that the original, "primitive" phase of capitalism is somehow a transitory phase that need not be repeated once commenced. Instead, Harvey maintains that primitive accumulation ("accumulation by dispossession") is a continuing process within the process of capital accumulation on a world scale. Because the central Marxian notion of crisis via "over-accumulation" is assumed to be a constant factor in the process of capital accumulation, the process of "accumulation by dispossession" acts as a possible safety valve that may temporarily ease the crisis. This is achieved by simply lowering the prices of consumer commodities (thus pushing up the propensity for general consumption), which in turn is made possible by the considerable reduction in the price of production inputs. Should the magnitude of the reduction in the price of inputs outweigh the reduction in the price of consumer goods, it can be said that the rate of profit will, for the time being, increase. Thus: