Anytime we receive a benefit from the allocation of a resource it comes at a cost because we could have allocated that resource toward resource.
Allocation of resources through the market mechanism resources are allocated using demand and Supply mechanism the products that are in demand are allocated more resources so they can supply more and come to equilibrium allocative efficiency.
An efficient allocation of resources is one that takes advantage of every opportunity to make some individuals better off in their own estimation while not worsening the lot of anyone else.
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