Following the GameStop trading frenzy, the SEC is expected to take a fresh look at payment for order flow, a decades-old practice that’s at the heart of how commission-free trading works. WSJ explains what it is, and why critics say it’s bad for investors. Illustration: Jacob Reynolds/WSJ
WSJ Glossary
Markets and economics are complex. It’s easy to be overwhelmed by a sea of wonky indicators and lose track of why they matter. This series breaks down the basic terms and ideas that move the markets.
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