The "Economic Calculation Problem" posits that

A. a system of voting/democracy always leads to outcomes which violate standard notions of rational preferences.
B. a system of planning will never be able to achieve efficient outcomes, precisely because under such a system the planners do not have access to the information generated by market transactions.
C. calculating the true economic value of a worker can only be done under a socialist system.
D. it is impossible to come up with any estimate of the costs of complying with government bureaucracy.