Nontariff trade barriers could include all of the following except domestic content laws government procurement policies health, safety, and environmental standards antidumping/countervailing duties applied to imports

The question seems to be asking which of the listed options is not considered a non-tariff trade barrier. The options given are:

1. Domestic content laws
2. Government procurement policies
3. Health, safety, and environmental standards
4. Antidumping/countervailing duties applied to imports

Let's go through each option:

1. Domestic content laws: These are laws that require a certain percentage of a product to be produced domestically. This is a non-tariff trade barrier as it restricts imports.

2. Government procurement policies: These are policies that dictate how a government can purchase goods and services. If a government only purchases from domestic sources, this can act as a non-tariff trade barrier.

3. Health, safety, and environmental standards: These are standards that imported goods must meet. If these standards are higher for imported goods than for domestic goods, they can act as a non-tariff trade barrier.

4. Antidumping/countervailing duties applied to imports: These are additional charges placed on imported goods to prevent dumping (selling at an unfairly low price). However, these are considered tariff barriers, not non-tariff barriers.

So, the answer to the question is "Antidumping/countervailing duties applied to imports" as this is a tariff barrier, not a non-tariff barrier.