Goods are usually classified into

Goods traded in an economy are grouped according to who uses them next. A producer good (also called a capital good) is one used by a business to make other goods or services, such as machinery, raw materials, or tools. A consumer good is one that goes directly to the final user for personal satisfaction, such as food, clothing, or furniture. Because every good produced in an economy ends up either feeding into further production or being consumed directly by households, this producer-and-consumer split is the standard broad classification used in commerce.

The other groupings mentioned are narrower distinctions within consumer goods rather than the general classification of all goods. Saleable and non-saleable goods is not a recognised commerce classification. Inferior and superior goods describes how demand for a good changes with income, and luxurious and essential goods describes how necessary a good is to a consumer; both apply only within the consumer-goods category, not to goods as a whole.

Examination reminder: when a question asks for the broadest way goods are classified, look for the option that could include every type of good in the economy, not one that only describes a subset of consumer goods.