On average, a trader makes more money than a broker. Traders typically have higher earning potential due to their ability to take more risks and capitalize on market movements. Brokers, on the other hand, typically earn commissions from their clients for executing trades.

Yes, a stock broker can trade stocks for themselves. However, they are subject to regulations that prohibit them from taking advantage of their clients' confidential information. Additionally, stock brokers are required to disclose any personal trades they make to their clients.