What term describes a collection of buyers and sellers of a specific good or service?

The term that best describes a collection of buyers and sellers of a specific good or service is "market." A market is a system or venue where transactions occur, allowing exchanges of goods and services. It includes all the participants – buyers who seek to acquire products and sellers who offer them. A market can take various forms, including physical locations like a farmers' market or virtual spaces like online platforms.

The term "economy" refers to the broader system of production, distribution, and consumption of goods and services within a community or region, encompassing all markets, sectors, and transactions. While connected, it does not specifically denote the interaction between buyers and sellers of a particular good or service.

"Trade" typically refers to the action of buying, selling, or exchanging goods and services, but it does not encompass the full structure of buyers and sellers as a market does. It can occur within a market but is not synonymous with the concept of a market itself.

Lastly, "industry" pertains to a group of businesses or organizations that produce or provide similar goods or services. While industries may contain several markets related to the specific products they handle, the term does not specifically define the interaction between buyers and sellers that occurs within a market.