Speculation is investment in the hope of capital gain rather than income gain. Many people consider speculators dangerous and, when the market loses its stability, some politicians make speculators the scapegoats for the crisis and try to regulate the market. Are they really responsible for it?
Economists usually consider consumption opposite to production. From the viewpoint of entropy, however, there is no difference between them. You can describe both of them as an increase in entropy of environment in compensation for reducing the entropy of a system.