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Choose online stock trading companies
This very informative link gives a clear and comprehensive comparison (pros and cons) of various popular brokers: https://www.nerdwallet.com/blog/investing/best-online-brokers-for-stock-trading/ (Best Online Brokers for Stock Trading 2016) There are indeed some significant cons for the super-low commission fee. Just for a quick example, the Interactive Broker requires a minimum of 10k account balance, as well as the frequent trading activity even on monthly basis (or the minimum $10 commission would be charged).