The price of bitcoin is skyrocketing, driving a rally of momentum trading that's pushed its value higher than it's ever been before. WSJ explains how bitcoin trading works, and why the volatile digital currency is reaching all-time highs. 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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