In the command economic system, a large part of the financial system is controlled by a central power. As in the USSR most decisions be made by the central govt. This type of economy is the core of the communist philosophy.
Since the govt. is such an important feature of the economy, it is often involved in everything starting from planning and ending in redistribution resources. The command economy is able to create a developed supply of its resources, and the rewards. This capability also means that the govt. usually owns all the important industries like utilities, aviation, and railroad.