A market is a place where buyers and sellers interact to trade goods, services, or assets. Markets can be local, national, or international depending on whether exchange is localized or crosses political boundaries. In a market, prices and quantities of goods and services are determined through supply and demand. Key aspects of a market include the place of exchange, goods/services being traded, buyers and sellers, and information sharing. Perfect competition is a theoretical market structure with many small firms, identical products, price-taking firms, and complete information for buyers. Oligopoly is a market where a small number of large firms dominate and influence each other's pricing decisions through strategic interactions. Monopoly and monopsony are structures with single sellers or