What aspect of the free enterprise system not subject to competition?

One aspect of the free enterprise system that is generally not subject to competition is the regulatory framework established by the government. Regulations, such as safety standards, environmental protections, and labor laws, create a level playing field that all businesses must adhere to, regardless of their individual competitive strategies. Additionally, certain public goods and services, like national defense and public education, are provided by the government and not subject to market competition.