But Seven-Eleven Japan's state-of-the art inventory tracking system had kept its managers in touch with shifts in demand, allowing them to respond speedily. The company, which controls an estimated onefifth of the corner-shop market, rose 230 yen or 6.3% to 3880 yen. What proved a boon for Seven-Eleven Japan also cast its listed parent in a favourable light. Ito-Yokado, which controls a shade over 50% of Seven-Eleven Japan, gained 260 yen or 6.6% to 4230.