Where can investors buy and sell securities, and how are securities markets regulated?

"16.7 Buying and Selling at Securities Exchanges 7. Where can investors buy and sell securities, and how are securities markets regulated? Securities are resold in secondary markets, which include both broker markets and dealer markets. The broker market consists of national and regional securities exchanges, such as the New York Stock Exchange, that bring buyers and sellers together through brokers on a centralized trading floor. Dealer markets use sophisticated telecommunications networks that link dealers throughout the United States. The NASDAQ and over-the-counter markets are examples of dealer markets. In addition to broker and dealer markets, electronic communications networks (ECNs) can be used to make securities transactions. In addition to the U.S. markets, more than 60 countries have securities exchanges. The largest non-U.S. exchanges are the London, Tokyo, Toronto, Frankfurt, Hong Kong, and Taiwan exchanges. The Securities Act of 1933 requires disclosure of important information regarding new securities issues. The Securities Exchange Act of 1934 and its 1964 amendment formally empowered the Securities and Exchange Commission and granted it broad powers to regulate the securities exchanges and the dealer markets. The Investment Company Act of 1940 places investment companies such as companies that issue mutual funds under SEC control. The securities markets also have self-regulatory groups such as the Financial Industry Regulatory Authority (FINRA) and measures such as “circuit breakers” to halt trading if the S&P 500 Index drops rapidly."