In Marxist study there is 'use value' and 'exchange value'. These separate values demonstrate the way in which employers pay workers less than the value of what they produce, this is the law of unequal exchange. Speculators drive up exchange values and in doing so create bubbles, this drives the boom and bust cycle of capitalist economy. What results is a system built on debt and speculative assets, a hollow economy. This must be corrected with a system rich with use values, the kind of things that feed children and keep us warm. Useful things are useful. Price is not value.