TOKYO -- Japanese shares are catching up with their U.S. and European counterparts after a poor start this year, now that concerns about European politics and the American economy have eased and overseas investors are worrying about missing buying opportunities here.
Yet the Tokyo market's gains lack the strength seen in the spring of 2015, when the Nikkei Stock Average was also flirting with the 20,000 mark. The key to a lasting rally lies in corporate reforms.
