In Smith there is a conception of a common good not provided by the market, a class analysis, a concern for the dehumanizing aspects of the factory system, and the concept of rent as being unproductive. Ricardo argued that the renting class was parasitic. This, and the possibility of a "general glut", an over accumulation of capital to produce goods for sale rather than for use, became the foundation of a rising critique of the concept that free markets with competition would be sufficient to prevent disastrous downturns in the economy, and whether the need for expansion would inevitably lead to war.