Exchanges help companies to capitalize by selling shares to the investing public.
They help public to mobilize their savings to invest in high yielding economic sectors, which results in higher yield, both to the individual and to the national economy.
They help companies to expand and grow by acquisition or fusion.
They help both casual and professional stock investors, to get their share in the wealth of profitable businesses.
Stock exchanges impose stringent rules to get listed in them. So listed public companies have better management records than privately held companies.
Small investors can also participate in the growth of large companies, by buying a small number of shares.
They help government to rise fund for developmental activities through the issue of bonds. An investor who buys them will be lending money to the government, which is more secure, and sometimes enjoys tax benefits also.
They maintain the stock indexes which are the indicators of the general trend in the economy.They also regulate the stock price fluctuations.