1. In the United States, one worker can produce 10 tons of steel per day or 20 tons of chemicals per day. In the United Kingdom, one worker can produce 5 tons of steel per day or 15 tons of chemicals per day.

The United Kingdom will gain the most from trade if:

1. 1 ton of steel trades for 2 tons of chemicals.
2. 1 ton of steel trades for 3 tons of chemicals.
3. 1 ton of steel trades for 0.5 ton of chemicals.
4. 1 ton of steel trades for 0.33 ton of chemicals.