The idea in a nutshell: the value of a producers’ good depends on the value of the consumers’ goods to which it contributes. Hence in deciding among alternative production methods, the most efficient choice is the one that economises on those producers’ goods that are needed for the most highly valued consumer’s goods.
But there’s a difference between technical efficiency and economic efficiency.
Suppose we’re comparing two ways of making widgets; method A uses three grams of rubber per widget produced while method B uses four grams of rubber per widget produced (with everything else being the same). In that case method A is clearly more efficient than method B; that’s a case of technical efficiency, because we can figure out which is more efficient just by looking at quantities expended without concerning ourselves with any economic concepts like demand.
But why couldn’t a state-socialist central planner have access to this information?
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