Final answer:
States can enforce standards different from federal requirements, and higher safety standards can be imposed on imported goods in comparison to where they were produced. International trade does not mandate uniform consumer safety standards among nations.
Step-by-step explanation:
Individual states can enforce standards that are not identical to federal requirements. This complex layering of laws is a result of the United States' federalist system, where both the federal government and state governments have the power to regulate in certain areas. For example, environmental regulations can be more stringent in certain states than what is mandated at the federal level. States have the right to prefer policies set at the national level and opt for standards of consistency across state and local governments. However, they are also allowed to impose higher safety standards on both locally produced goods and imported goods than those that exist in the country where the goods were produced. The rules of international trade do not require that all nations impose the same consumer safety standards, which allows countries to implement higher standards if they choose to do so.