One power reserved for the states is the ability to regulate

intrastate commerce. This means that the states can establish and enforce laws and regulations relating to commerce that occurs within their own borders. This can include setting standards for the quality and safety of goods and services, licensing and regulating businesses, and imposing taxes and fees on commerce activities. The states also have the power to regulate professions and occupations within their jurisdiction. However, this power is subject to limitations and should not interfere with or conflict with federal regulations and laws related to interstate commerce.