Assuming buyers act rationally and there is no market failure, what can be said about free market outcomes?

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Free market outcomes are efficientFree market outcomes optimize total surplusAll of the above statements are trueFree market outcomes are fairFree market outcomes are both efficient and optimize total surplus

Explanation

When buyers behave rationally and no market failures exist, free market outcomes are efficient. While they also maximize total surplus, the key point is efficiency, which makes option A the correct choice.