please answer these 3 questions

Please answer these 3 questions below. Be very detailed.

1. Describe in detail how the relationship between the world price and the domestic price determines whether a nation would be an importer or exporter with world trade.

2. Describe what a tariff is and its economic effects.

3. Suppose that Congress imposes a tariff on imported steel to protect the U.S. steel industry from foreign competition. Describe in detail the effect this would have on the consumer surplus, the producer surplus, and the total surplus. Make sure to explain why these changes occur.

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