survive. Unless socialist economies allow for some free markets which provide the pricing information possible, socialist economies would soon collapse. Von Mises' claims were strengthened by the fact that this is exactly what happened in cases such as the Soviet Union, where socialist states attempted to abolish all markets. The result is that no socialism in practice can dispense with market exchanges. Consequently, socialism attacks the market at the same time it is forced to utilize the market process. The mixed economy Sometimes called interventionism, the mixed economy is a compromise or mix, between capitalism and socialism. Most countries that we identify as "capitalist" and "socialist" are really different degrees of a mixed economy. Nash argues that there can never be a sustainable mixed economy. Any economy that tries to mix socialism and capitalism will inevitably collapse into one of the two. Christian left Nash is a critic of the Christian left, particularly Jim Wallis, Ron Sider, and Tony Campolo. He argues that this group has good intentions for helping the poor, but flawed economic theory. He states that the criticisms generally leveled against capitalism are in fact criticisms of government intrusion into market activities. He argues that economic exchanges come in two varieties: by peaceful means and by violent means. The former can be stated as "if you do something good for me, I will do something good for you." The latter can be stated as "if you do not do something good for me, I will do something bad for you." Government intervention into the economy, such as by income taxes, are part of the latter system, and not the former. He states that socialism, by definition, cannot be voluntary, since under socialism, capital is either owned or controlled by the state. Nash states that the problem with this system is that it shuts off important signals that entrepreneurs might otherwise use in making economic decisions. When the government owns the land, labor, utilities, factory, and other factors of production, it becomes impossible to tell how much it costs to produce a good or service. The Soviet Union was able to function because it sent spies to capitalist nations to obtain pricing information. Capitalism, Nash argues, is not economic anarchy. He states that capitalism is a system of voluntary relationships which protect people's rights against force, fraud, theft, and violations of contract. Nash states that the Christian left