ANOTHER STIMULUS, XI? China says it will pump $54 billion into banks and insurers — but their stocks still fell. “The moves build on a 500 billion yuan capital injection into four major state banks last year and a pledge in March to issue 300 billion yuan in special treasury bonds this year to replenish capital at large state lenders. China’s banking sector has been grinding through a multiyear margin compression, as Beijing pushes lenders to keep credit cheap for struggling borrowers. The net interest margins — the spread between what banks earn on loans and pay on deposits — fell to record lows this year.”