Will Commission-Free Trades Change Investing?

Charles Schwab, TD Ameritrade, and now Etrade have all demolished trade fees for purchasing and selling stocks. Now that they are commission-free, will this change how consumers invest? Should Robinhood be concerned?
Matter of Time?
Robinhood was the first investment firm I heard of that had no transaction fees. I quickly signed up in 2015 and told everyone I knew that it was the way to go if you...
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