In short, international trade in livestock, poultry, and products to the US are very important because other countries are better equipped for certain products and goods. So international trade allows for the US to have access to those products and goods that may not be produced in the US at the demanded quantities and quality.
3. the first one.
4. I would say the third one
The purpose of policies is to help your organization tie together your mission, vision, values, and culture into clearly written and easily accessible documents for all employees to take to heart.