New York
ANALYSTS predict Standard & Poor's 500 Index profits are about to decrease for three straight quarters. Investors better hope they don't. History shows that once earnings drop for that long, they almost always keep falling, and usually take the market with them. In fact, among 17 declines that got to nine months since the Great Depression, exactly one stopped there, in 1967.
Any sign that US earnings are about to collapse is enough to strike fear in money managers who have watched shares triple as profits rose almost every year since 2009. Even if analysts are right about the duration of the skid, earnings contractions of three quarters or more have triggered bear markets 82 per cent of...