Respuesta :
An efficient economy is one that makes the least costly use of its resources.
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The correct answer is D.
An efficient economy is the one which can produce goods and services to satisfy the needs of consumers at the cheapest price. This means that, given a certain endownment of resources, the economy is able to generate a greater amount of output, if compared to other economies, or that, on the other hand, is able to produce the same output with fewer resources.