The success of SK Hynix and Samsung helped make South Korea’s stock market one of the world’s hottest in recent years—but also one of the most volatile. WSJ reporter Jack Pitcher tells us about the “Rollerkospi,” and what its wild ride could mean for the broader AI trade. Plus, buying a refurbished phone might save you a few hundred dollars, but it could also come with unexpected problems. Personal tech columnist Nicole Nguyen breaks down what to look out for to avoid stress, scams, and spyware. Imani Moise hosts.
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