Final answer:
With free trade, a small open economy experiences an increase in surplus and benefits from competition and variety. All of the above options are correct.
Step-by-step explanation:
In a small open economy transitioning from autarky to free trade, the following statements are true:
- The surplus of domestic producers increases
- The surplus of domestic consumers increases
- Total surplus increases
- The "rest of the world" (international market) has the cost advantage
Opening the domestic import market to free trade allows for increased competition, variety, and access to economies of scale, leading to overall benefits for both producers and consumers.