Premarket: World stocks brighten at end of grim quarter, bond yields stabilize

World shares were broadly higher on Friday, but were set to end September with their worst quarterly performance in a year, haunted by worries over elevated interest rates. European shares rose, helped by gains for luxury stocks, and U.S. equity futures pointed to a firm start for Wall Street later in the day . Yet, as the third quarter drew to a close, world stock markets were left nursing heavy losses on rising bond yields. Bond markets were broadly stable, but are also ending a torrid quarter. Euro zone government bond yields, which along with U.S. Treasury yields have hit…