How has online investing changed securities trading costs?

"Improvements in internet technology have made it possible for investors to research, analyze, and trade securities online. Today almost all brokerage firms offer online trading capabilities. Online brokerages are popular with “do-it-yourself” investors who choose their own stocks and don’t want to pay a full-service broker for these services. Lower transaction costs are a major benefit. Fees at online brokerages range from about $4.95 to $8.00, depending on the number of trades a client makes and the size of a client’s account. Although there are many online brokerage firms, the four largest—Charles Schwab, Fidelity, TD Ameritrade, and E*Trade—account for more than 80 percent of all trading volume and trillions in assets in customer accounts. The internet also offers investors access to a wealth of investment information. With competition from companies such as Robinhood, a start-up app that offers $0 fees for stock trades, online trading firms have rushed to reduce their fees to attract more overall business, and a price war has ensued. Fidelity and Charles Schwab lowered their fees for online stock and exchange-traded funds to $4.95; Ameritrade and E*Trade reduced their fees from $9.99 to $6.95. So how will these firms continue to make money? They believe that lowering the price of entry for trading stocks will allow them to “sweep up” customer assets—meaning firms have an opportunity to attract new customers who not only will take advantage of low trading fees but will be interested in other financial products offered by these investment companies."