The exchange may offer privileged services like high-frequency trading to larger clients like mutual funds and asset management companies (AMC), and earn money accordingly. There are provisions for regulatory fee and registration fee for different profiles of market participants, like the market maker and broker, which form other sources of income for the stock exchanges.
Preferred stocks are very different from shares of common stock most investors own. Holders of preferred stock are always the first to receive dividends, and in cases of bankruptcy, will be first to get paid. However, the stock price does not fluctuate the way common stock does, so some gains can be missed on companies with hypergrowth. Preferred shareholders also get no voting rights in company elections. They're a hybrid of common stock and bonds.
Should the company management and majority owners choose, they can pay one or more dividends per year to stockholders. The money for these dividends will typically come from profits earned within the business. In most countries, these dividends are subject to income tax payable by the receiver. Often there is a withholding tax taken at source to ensure that non-resident shareholders pay as well.
Now I know GE has been a dog for the last couple of years, shares are down 60% since the 2016 high. But management has made the tough decisions, selling off some assets and spinning off others. Cash flow is protected and I don’t think the market is giving the company credit for it yet. I think a solid turnaround in stock price could start in 2020 with even more gains over the next five years.
This is a more advanced topic for those who want to do what is called « day trading », i.e. those who plan to buy and sell on a daily basis as their main activity. Arbitraging is the process of leveraging price differences between exchanges to make a profit, by buying cryptocurrency cheap on a given exchange and selling it for a higher price on a different exchange.
Fees beyond trade commissions include inactivity fees (common with active trading brokers such as Interactive Brokers, Lightspeed, and TradeStation) and IRA fees for having a retirement account. While most brokers do not charge predatory fees, it’s still important to do your due diligence. Just like a bank account, stock brokers also make a portion of their profits off miscellaneous fees.