Elon Musk has rebuffed the idea that Tesla could put money into the struggling carmaker Nissan, after a report that said a Japanese group was seeking its investment sent shares soaring. Nissan’s stock market value jumped by 9.5% on Friday after claims that the former prime minister Yoshihide Suga was among those who want the US electric carmaker to become a strategic investor, possibly in exchange for Nissan’s American factories. Musk immediately appeared to reject the idea but Nissan’s Tokyo-listed share price still closed at 458.80, its highest since early January during short-lived merger talks with the larger Japanese rival...