Zero-commission trading opened the door.
Retail investors were sold a simple story.
Trading would be cheaper. Access would be wider. Information would move faster. The old barriers would fall, and everyday investors would finally get a fairer shot. In one sense, that happened. Millions of people can now buy stocks, ETFs, options, and crypto from a phone in seconds. The days of clunky brokerage desks and high commissions feel ancient. But the deeper question has never really gone away: if markets are more open than ever, why does it still feel like the house keeps winning?
That question is back for a reason.
The US market has spent years debating whether “free” trading actually made markets fairer, or whether it simply changed how the costs are hidden. Payment for order flow, internalization, fragmented venues, and concentrated market-making power all sit at the center of that debate. Reuters reported during the SEC’s market-structure push that critics saw payment for order flow as a conflict of interest, while major market makers had captured a huge share of US retail orders.
That is the real issue.
The modern retail investor may have more access, but access is not the same thing as power.
Free trading was never really free
The revolution in retail investing was built on a seductive idea: zero commissions. That changed behaviour overnight. More people entered the market, more people traded more often, and speculative culture moved from the edges to the center. Reuters noted that the meme-stock era exploded partly because zero-fee apps made it easier for anyone with a smartphone to jump into the market.
But “free” trading has always had a catch.
In many cases, brokers route customer orders to market makers that pay for that flow. The SEC has studied how payment for order flow works and how it shapes execution, routing, and transparency. Even where brokers disclose those arrangements, the structure creates an obvious tension: is the broker sending your order where it gets the best outcome for you, or where the economics work best for them? Supporters argue that the system gave retail traders tighter spreads, instant execution, and no upfront commissions. Critics argue that it turned customer orders into a product to be sold.
Both can be true at once.
And that is why so many people feel the market is fair on the surface but tilted underneath.The market may be open, but power is still concentrated, This is where the frustration gets sharper.