point to the mass killings under communist regimes as an indictment of socialism. Critique of centralized planning Distorted or absent price signals The economic calculation problem is a criticism of central economic planning which exists in some forms of socialism. It was first proposed in 1854 by the Prussian economist Hermann Heinrich Gossen. It was subsequently expounded in 1902 by the Dutch economist Nicolaas Pierson, in 1920 by Ludwig von Mises and later by Friedrich Hayek. The problem referred to is that of how to distribute resources rationally in an economy. The free market relies on the price mechanism, wherein people individually have the ability to decide how resources should be distributed based on their willingness to give money for specific goods or services. The price conveys embedded information about the abundance of resources as well as their desirability (supply and demand) which in turn allows—on the basis of individual consensual decisions—corrections that prevent shortages and surpluses. Mises and Hayek argued that this is the only possible solution and without the information provided by market prices socialism lacks a method to rationally allocate resources. Those who agree with this criticism argue it is a refutation of socialism and that it shows that a socialist planned economy could never work. The debate raged in the 1920s and 1930s and that specific period of the debate has come to be known by economic historians as "the Socialist Calculation Debate". Mises argued in a famous 1920 article "Economic Calculation in the Socialist Commonwealth" that the pricing systems in socialist economies were necessarily deficient because if government owned the means of production, then no prices could be obtained for capital goods as they were merely internal transfers of goods in a socialist system and not "objects of exchange", unlike final goods, therefore they were unpriced and hence the system would be necessarily inefficient since the central planners would not know how to allocate the available resources efficiently. This led him to declare "that rational economic activity is impossible in a socialist commonwealth". Mises developed his critique of socialism more completely in his 1922 book Socialism, An Economic and Sociological Analysis. Mises argued that a socialist system based upon a planned economy would not be able to allocate resources effectively due to the lack of price signals. Because the means of production would be controlled by a single entity, approximating prices for capital goods in