Production is efficient when the economy is producing at a point on the production possibilities frontier. Hence, Option 1. is the correct statement.
A production possibilities frontier, or PPF, defines the set of feasible mixtures of products and offerings a society can produce given the sources available. Choices outside the PPF are unattainable and alternatives within the PPF are inefficient.
Therefore, Production is efficient when the economy is producing at a point on the production possibilities frontier. Option 1. is the correct statement.
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