An import tariff of $10 per unit of imported good imposed by a large country:

1. Increases price of this good in importing country by less than $10 and lowers export prices.
2. Increases the volume of exports of that good by foreigners.
3. Increases the price of this good in the importing country by more than $10 and raises export prices.
4. Increases price of this good in importing country by $10 & leaves export price unaffected.
5. Is an ad-valorem tariff.