The document defines a market as a place where buyers and sellers meet physically or virtually to conduct transactions. A market has buyers and sellers of a commodity, with one price determined by supply and demand. Markets can be classified by area (local, regional, national, international), time period (short, long), level of competition (perfect, imperfect), function (general, specialized, sample-based, grade-based), nature of commodity (products, stocks, bullions), and legality (legal, illegal). The size of a market depends on factors like the nature of demand, durability and portability of goods, availability of substitutes, and multi-use potential of products.