While stock investors wait for the benefits of cheaper oil to seep into the economy, all they can see lately is downside. Forecasts for first-quarter profits in the Standard & Poor’s 500 Index have fallen by 6.4 percentage points from three months ago, the biggest decrease since 2009, according to more than 6,000 analyst estimates compiled by Bloomberg. Reductions spread across nine of 10 industry groups and energy companies saw the biggest cut . Earnings pessimism is growing just as the best three-year rally since the technology boom pushed equity valuations to the highest level since 2010. At the same time, volatility has surged in the American stock market as oil’s 55 percent drop since June to below $49 a barrel raises speculation that companies will cancel investment and credit markets and banks will suffer from debt defaults. “Either there is nothing to worry about and crude is going […]