 Some things that firms may wish to sell, and that people may wish to buy, pose a significant risk of harm, to the user and others. When is a product too unsafe to be sold? This question is often answered by government agencies. In the U.S., a number of government agencies, including the Consumer Product Safety Commission (CPSC), the National Highway Traffic Safety Administration (NHTSA), and the Food and Drug Administration (FDA), are responsible for assessing the safety of products for the consumer market. In some cases these standards are mandatory (e.g., medicines and medical devices); in other cases they are voluntary (e.g., trampolines and tents). The state identifies minimum standards and individual businesses can choose to adopt more stringent ones.