What a difference a month makes. Standard & Poor's, the world's leading index provider, announced that the world's developed and emerging markets shook off a fear-provoking month of March with impressive returns in April. According to Standard & Poor's monthly global stock market review, The World by Numbers, developed markets posted a 5.15% gain in April after losing 8.95% in March. Likewise, emerging markets climbed 7.49% in April after falling 5.11% the month before.