South Korea Opens Currency Market Round-the-Clock After 29 Years

South Korea's won can now trade 24 hours a day, ending a restriction dating back to the 1997 financial crisis. The change lets foreign investors buy and sell anytime, which the government hopes will boost South Korea's standing globally. The won weakened sharply earlier this year—it trades at its lowest level in 17 years. Overnight trading could amplify those swings.