Final answer:
A doctor is most likely to purchase malpractice insurance, which provides protection against claims of negligence and errors that could lead to patient harm.
Step-by-step explanation:
The professional most likely to purchase malpractice insurance is a doctor. Malpractice insurance is a specialized type of professional liability insurance that covers healthcare professionals against claims of negligence and mistakes that lead to patient harm or dissatisfaction. This type of insurance is essential for doctors as it helps to protect them financially from the potential high costs of legal defense and settlement fees in the case of lawsuits. Other professionals such as grocery store cashiers, software developers, and taxi drivers typically have different types of insurance related to their industries, like general liability or professional liability insurance, but these are not specifically malpractice insurance.