Final answer:
Government Regulatory Authorities are responsible for ensuring that only licensed persons perform services at a shop.
Step-by-step explanation:
The responsibility for ensuring that only licensed persons perform services at a shop lies with Government Regulatory Authorities. These authorities are responsible for enforcing federal laws and regulations related to licensing and supervision of businesses. They set standards and guidelines that shops must follow to ensure that only qualified and licensed professionals provide services. Shop owners or managers also play a role in ensuring compliance with these regulations and may face penalties if they allow unlicensed individuals to perform services.