Which of the following statements about the specific-factors model is true?
1) When imports rise, revenues of firms that compete with imports fall. The decrease in revenue is divided among the factors of production equally.
2) When exports of a product rise, specific factors gain less and mobile factors gain more; when imports rise, specific factors gain more and mobile factors gain less.
3) When exports of a product rise, specific factors used in exports gain more than mobile factors; when imports rise, specific factors in import competing industries lose more than mobile factors.
4) When exports of a product rise, the increase in revenue is divided among the factors of production equally.