The Federal Reserve’s 25-basis-point rate increase widened the gap between the United States and South Korea to 1 percentage point, adding pressure on the won and domestic inflation. The Fed’s projections indicate that 16 of 18 Federal Open Market Committee participants see another increase by year-end, keeping upward pressure on government bond yields and potentially increasing volatility in Korean equities, including the Kospi. The 10-year Treasury yield remained at 5.023% after the decision. The Bank of Korea, whose benchmark rate is 3.00%, must weigh an October hold against another increase in November, as well as the timing of a possible move to 3.25%. Analysts say the won’s reaction, inflation and financial conditions will be central to the decision on Oct. 22.