When Prime Minister Shinzo Abe raised Japan’s sales tax from April, he was betting he could break a jinx that has doomed leaders who raised the levy to losing their jobs. A shock move by the Bank of Japan on Friday to expand its massive asset-buying stimulus program – in the hope it will stoke inflation – could boost the chances of a rise in the unpopular levy from October, especially if followed by promises of added fiscal stimulus to help offset the pain.