How do securities markets help firms and governments raise capital?

"Stocks, bonds, and other securities trade in securities markets. These markets streamline the purchase and sales activities of investors by allowing transactions to be made quickly and at a fair price. Securities are investment certificates that represent either equity (ownership in the issuing organization) or debt (a loan to the issuer). Corporations and governments raise capital to finance operations and expansion by selling securities to investors, who in turn take on a certain amount of risk with the hope of receiving a profit from their investment. Securities markets are busy places. On an average day, individual and institutional investors trade billions of shares of stock in more than 10,000 companies through securities markets. Individual investors invest their own money to achieve their personal financial goals. Institutional investors are investment professionals who are paid to manage other people’s money. Most of these professional money managers work for financial institutions, such as banks, mutual funds, insurance companies, and pension funds. Institutional investors control very large sums of money, often buying stock in 10,000-share blocks. They aim to meet the investment goals of their clients. Institutional investors are a major force in the securities markets, accounting for about half of the dollar volume of equities traded."