property profit calculator Market is the inevitable product of the division of labor and the development of commodity economy. At the same time, the market also promotes the social division of labor and the further development of commodity economy during its development and expansion. The market through information feedback directly affects the production of people, how much production, and the market time, product sales status, etc.; Middle link commodity economy development process, supply and sale, the parties to provide production, supply and sale parties exchange places and other exchange, exchange time, to realize the commodity producers, operators and consumers their own economic interests. Last year, labour market economist John Philpott found that more than one in five workers, around 7.1 million people, were in precarious employment, up from 5.3 million in 2006. "People say 'oh, those experts', but we're seeing what we call potential risks being rolled out. This is not what the experts say, this is what the economy is showing. " Keynes argued that savings and investment were two interdependent variables, not two independent variables.