LONDON—Shares rose on Friday, buoyed by stellar corporate earnings results, but strong oil prices and stalling car sales in Europe were a reminder of headwinds for the world economy. The STOXX index of 600 European shares was up 0.2 percent at three-week highs. Britain’s FTSE 100 also gained 0.2 percent, the UK blue-chip index having recovered all ground lost since the coronavirus pandemic began in March last year. “There is an element of complacency. Markets have been trying to make up their mind on whether inflation is transitory, are supply chain disruptions are going to translate into higher costs,” said Mike Hewson, chief markets analyst at CMC Markets. “But this week’s earnings from various companies are assuaging some of those concerns that companies won’t be able to pass on some of these cost rises to consumers, and that’s why we are seeing the increase in risk,” Hewson said. Strong earnings …