NEW YORK, March 9 : A stunning surge in oil prices above $100 a barrel is rattling U.S. stock investors, as they brace for an even sharper rise in energy prices that could stagger the economy and further damage equities. The 50 per cent jump in U.S. crude to its highest level in more than three years is among the most significant financial consequences of the U.S.-Israeli war on Iran, as investors continue to calibrate economic and market fallout following the attacks launched just over a week