Functions of a Stock Exchange

A stock exchange performs several distinct functions in the economy, well beyond simply being a place where trades happen.

1. Providing liquidity and marketability to securities. This is the primary function: it allows an investor to sell existing securities and convert them into cash, or to buy securities, whenever they wish, at a transparent price — without this, investors would hesitate to subscribe to new issues at all.

2. Fair price determination (price discovery). The continuous interaction of a very large number of buyers and sellers ensures that a security's price reflects all publicly available information about the company at any given moment — a process economists call price discovery.

3. Safety of transactions. Because every recognised stock exchange trades only among registered members under strict rules, and every transaction is guaranteed and settled through a Clearing Corporation, investors face far less risk of default or fraud than they would in an informal, unregulated deal.

4. Mobilisation and channelling of savings into investment. By assuring investors of liquidity and safety, the stock exchange encourages households to channel their savings into corporate securities rather than leaving them idle — directing the economy's savings towards productive investment.

5. Contributes to capital formation. Although the stock exchange itself trades only existing securities, its presence is what makes companies' primary-market issues attractive to subscribe to in the first place, since investors know they can exit later. In this indirect but essential way, it supports the whole process of capital formation in the economy.

6. Regulation of company management, indirectly. A listed company's performance is continuously priced and judged by the market; poor management or governance is quickly reflected in a falling share price, creating pressure on management to perform and to be transparent (through the exchange's own listing and disclosure requirements). …