commission broker: a person who does the trades for a
stock broker's clients, receiving a commission for the work.
The stock broker places orders with them.
common stock: a security that represents ownership in a
corporation. Regular old stock. Owners of this bottom rung of
stocks have a piece of the company and get tovote for the board
of directors and on corporate policy. But they have toqueue up
behind owners of preferred stock both toreceive dividends and
usually to receive assets if a company is liquidated.