A marketplace where brokers buy and sell securities is known as what?

A marketplace where brokers buy and sell securities is specifically known as a stock exchange. This is because a stock exchange provides a regulated environment where stocks, bonds, and other securities can be traded.

Stock exchanges, such as the New York Stock Exchange (NYSE) or the Nasdaq, facilitate transactions by providing a platform for buyers and sellers to come together, ensuring transparency, liquidity, and fair pricing of securities. Brokers play a critical role in this process by executing trades on behalf of clients, making the exchange a central point for stock market activities.

Other options like a banking house and a financial institution broadly refer to entities involved in managing money and providing financial services, which may include lending, savings, or investment products but do not specifically focus on the trading of securities as a primary function. An investment club is a group of individuals who pool their money to invest collectively but is not a formal market for buying and selling securities like a stock exchange is. Therefore, the clarity and specificity of what constitutes a stock exchange make it the correct choice in this context.