money not be required for even that role. Planned economy A planned economy is a type of economy consisting of a mixture of public ownership of the means of production and the coordination of production and distribution through economic planning. A planned economy can be either decentralised or centralised. Enrico Barone provided a comprehensive theoretical framework for a planned socialist economy. In his model, assuming perfect computation techniques, simultaneous equations relating inputs and outputs to ratios of equivalence would provide appropriate valuations in order to balance supply and demand. The most prominent example of a planned economy was the economic system of the Soviet Union and as such the centralised-planned economic model is usually associated with the communist states of the 20th century, where it was combined with a single-party political system. In a centrally planned economy, decisions regarding the quantity of goods and services to be produced are planned in advance by a planning agency (see also the analysis of Soviet-type economic planning). The economic systems of the Soviet Union and the Eastern Bloc are further classified as "command economies", which are defined as systems where economic coordination is undertaken by commands, directives and production targets. Studies by economists of various political persuasions on the actual functioning of the Soviet economy indicate that it was not actually a planned economy. Instead of conscious planning, the Soviet economy was based on a process whereby the plan was modified by localised agents and the original plans went largely unfulfilled. Planning agencies, ministries and enterprises all adapted and bargained with each other during the formulation of the plan as opposed to following a plan passed down from a higher authority, leading some economists to suggest that planning did not actually take place within the Soviet economy and that a better description would be an "administered" or "managed" economy. Although central planning was largely supported by Marxist–Leninists, some factions within the Soviet Union before the rise of Stalinism held positions contrary to central planning. Leon Trotsky rejected central planning in favour of decentralised planning. He argued that central planners, regardless of their intellectual capacity, would be unable to coordinate effectively all economic activity within an economy because they operated without the input and tacit knowledge embodied by the participation of the millions of people in the economy. As a result, central planners would be unable to respond to local economic conditions. State socialism