Answer: B. an output of the product that is less than the amount consistent with ideal economic efficiency
Explanation: Economic efficiency is the state in which all available resources are optimally allocated to serve each individual or entity in the best way while reducing to the minimum, waste and inefficiency. In reality, economic efficiency has shown that nothing can be improved without something else being hurt.
When competitive forces are weak, it leads to decrease in output as economic efficiency is only maximized when price is equal to marginal revenue because at this point both profit and efficiency are maximized.
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Producers, Consumers, and Money
If producers can not make items and consumers can not buy gems both without having money then items become scarce.