The Supreme Court on Monday sent a case involving a shareholder class-action lawsuit against Goldman Sachs Group Inc. back to a lower court. The high court ruled that a federal appeals court needs to again consider whether the suit can proceed. Investors led by the Arkansas Teacher Retirement System filed the suit, which accused the bank of hiding conflicts of interest related to mortgage-backed securities. Market Pulse Stories are Rapid-fire, short news bursts on stocks and markets as they move. Visit MarketWatch.com for more information on this news.