Which of the following statements is TRUE?
1) A country's exports are determined by its ability to match other countries' productivity.
2) A country's exports are determined by its high productivity in the industry compared with that of foreigners.
3) A country's exports are determined by its relative high productivity in the industry compared with its relative productivity in other sectors.
4) A country's exports are determined by its low productivity in the industry compared with that of foreigners.