A Wall Street worker is someone who works in the financial sector of the economy, typically in New York City. An ANALYST is someone who studies and evaluates financial data to make informed decisions. A BROKER is someone who buys and sells securities on behalf of clients. A TRADER is someone who buys and sells securities for their own account. An ARB is an arbitrageur, someone who takes advantage of price discrepancies in different markets. A market ANALYST is someone who studies and evaluates the performance of the stock market. A securities ANALYST is someone who studies and evaluates the performance of individual stocks.