Final answer:
The domestic supply of the metal will increase if the world price decreases.
Step-by-step explanation:
In this scenario, the domestic supply of the metal will increase if the world price decreases.
When the world price decreases, importing the metal becomes less expensive, making it more profitable for domestic U.S. mines and mills to supply a higher quantity of the metal to the market.
This is because at a lower world price, domestic producers can still earn a profit by selling the metal in the domestic market.