Millions of Russians starved in the 1920s and 1930s. As Mises pointed out, the raw materials, labor, tools, and machines used in socialist production are outside the market. They are owned by government and controlled by government planners. No one can buy or sell them. No market prices can develop for them because they aren't exchangeable.
Modern production is time-consuming and complicated.
Producers must consider alternatives when deciding what to produce. And they must consider various means of production when deciding how to produce. Raw materials, tools, and machines must be devoted to the most urgent projects and not wasted on less urgent ones. Consider, for instance, the planning of a new railroad. No central planner, even with a staff of statisticians, could master the countless possibilities.