Under no circumstances.

If a worker in country D could produce fewer than 3 tents a week.

If a worker in country D could produce 3 tents a week.

If a worker in country D could produce more than 3 tents a week

If the countries did not trade, then E would have a lower opportunity cost for tractors

Even though there is trade, E has a lower opportunity cost for tractors.

E is sure to produce no televisions while F is sure to produce no tractors.

Neither country can consume at a point outside its production possibility frontier.

Two countries may benefit from trade, even if their production possibility frontiers have identical shapes, if preferences differ in the two countries.

Two countries may benefit from trade, even if their production possibility frontiers have identical shapes, if industries have substantial economies of scale.

When two countries benefit from the opening up of trade, all citizens in each country will benefit.

Differences in the degree of human capital offer one reason why two countries may have production possibility frontiers that differ in shape.

Consumer surplus from the good will decrease.

Producer surplus from the good will decrease.

The quantity imported will fall.

The deadweight loss will be less than the total fall in surplus.

The total consumer plus producer surplus decreases.

The price for consumers rises from the pre-tariff situation by the amount of the tariff

If other countries do not retaliate, the country may be better off.

If other countries do not retaliate, the country may be worse off.