Wall Street makes its best producers into managers. The reward for being a good producer is to be made a manager. The best producers are cutthroat, competitive, and often neurotic and paranoid. You turn those people into managers, and they go after each other. They no longer have the outlet for their instincts that producing gave them. They usually aren't well suited to be managers. Half of them get thrown out because they are bad. Another quarter get muscled out because of politics. The guys left behind are just the most ruthless of the bunch. That's why there are cycles on Wall Street--why Salomon Brothers is getting crunched now--because the ruthless people are bad for the business but can only be washed out by proven failure.