Meaning and Classification of Market

In everyday language, "market" often means a physical place — a vegetable market, a cloth market, a stock exchange building — a location where buyers and sellers physically gather. Economics uses the word in a wider, functional sense. A market exists wherever buyers and sellers of a commodity are in such close contact, whether in person, by telephone, or increasingly online, that a single price tends to prevail for that commodity across the whole market. What matters to an economist is not a shared physical roof but a shared price-determining mechanism — how closely buyers and sellers can communicate offers and settle on a going rate. This is why an economist can speak of the "market for wheat" or the "market for two-wheelers" as a single entity even though no single building houses every wheat farmer and every flour mill, or every scooter buyer and every dealer, at once.

Because markets differ enormously in how they actually work, economists classify them along several independent lines rather than treating "the market" as one uniform idea. By geographical area, a market may be local (a village vegetable market), national (the Indian market for two-wheelers), or international (the global market for crude oil), depending on how far buyers and sellers are willing and able to reach to trade. By time period, Alfred Marshall's classic distinction separates the very short period (supply is completely fixed — the day's catch of fish that must be sold before it spoils), the short period (output can be varied using the existing plant and machinery but the scale of the firm cannot change), and the long period (firms can change even their scale of plant, and new firms can enter or existing ones exit). For this chapter, however, the classification that matters most is by the degree of competition — how many sellers operate, whether they sell an identical or a differentiated product, and how freely new firms can enter or leave the industry. On this basis, economists identify four broad market forms: perfect competition, monopoly, monopolistic competition, and oligopoly, arranged roughly from the most competitive to the least.

The degree-of-competition classification rests on four underlying features that this chapter returns to repeatedly for each market form: (i) the number of sellers; (ii) the nature of the product — whether every seller's product is identical (homogeneous) or each seller's product is somewhat different from its rivals' (differentiated); (iii) freedom of entry and exit — how easily a new firm can start producing, or an existing firm can stop, in response to profit opportunities; and (iv) the degree of control an individual seller has over the price at which the product sells. A student working through the Gujarat Std 11 Economics syllabus should treat these four features as a checklist — every market form covered in this chapter can be fully described by stating where it stands on each of the four.