Mom and pop trading has spiked to record levels as brokers shift to zero commissions

Trading volume has exploded at TD Ameritrade, E-Trade, and Charles Schwab, as retail investors make their way into the world of equity investing at record rates, Bloomberg reported. 
Charles Schwab slashed commission in October and TD Ameritrade and E-Trade quickly followed, bringing down a financial barrier to stock trading.
The inflows come as equity indices reach historic highs and some of the names retail investors are most interested in are at soaring valuations.
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