What is the term for a person engaged in trading goods who has specialized knowledge?

The term for a person engaged in trading goods who has specialized knowledge is 'merchant.' Merchants are individuals or entities primarily involved in the buying and selling of goods, often having extensive knowledge about the products they deal with, market trends, pricing, and customer preferences. This specialized knowledge enables them to navigate the complexities of trade effectively, making informed decisions about inventory and sales strategies.

Retailers, on the other hand, typically sell directly to consumers and might not possess the same level of specialized knowledge about the broader market. Distributors focus on the logistics of moving goods from manufacturers to retailers or other businesses and may not engage directly in trade. Suppliers provide products or raw materials to other businesses, but the term 'merchant' more specifically denotes someone who actively engages in trading and has that depth of expertise.