When a PPF is drawn as a

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downward$-$sloping straight line, this means that:

There is a decreasing opportunity cost of producing the two goods.

There is a constant opportunity cost of producing the two goods.

Only one of the two goods can be produced during any one period.

One of the goods is an input for producing the other good.

Which one of the following

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concepts is not illustrated by a production possibilities frontier?

Scarcity.

The tradeoff between producing one good versus another.

Monetary exchange.

Opportunity cost.

Ted chooses to study for his

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economics exam instead of going to the concert. The concert he will miss is Ted's of studying for the exam.

Monetary cost.

Absolute cost.

Comparative cost.

Opportunity cost.

There are two goods, X and Y $.$ If

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the opportunity cost of producing $gdx$ is lower for Lara than for Sara, then:

Lara has a comparative advantage in the production of Y $.$

Sara has an absolute advantage in the production of $x.$

Lara has a comparative advantage in the production of $x.$

Sara has a comparative advantage in the production of $x.$

Choose the correct answer $?$