The Fed dominated headlines this week, but Japan also raised interest rates, taking its policy rate to a three-decade high. The move was viewed as less convincing and triggered a sharp overnight weakening of the yen. The United States recently intervened alongside Japan to support the currency because of potential knock-on effects. American markets appeared to be taking the development in stride, with stocks positioned for another gain and bond yields stable. The day also marked Warren Buffett’s planned departure as chairman of Berkshire Hathaway.