The One Data Point That Could Determine Whether This Rally Lasts

Wall Street, for all its complexities, has been reduced to drooling, Pavlovian puppy dogs when Federal Reserve Chair Janet Yellen takes the microphone, as she did earlier this week. The Dow Jones Industrial Average surged up and out of a three-week consolidation range after Yellen on Tuesday talked up the downside risks to the economy, talked down the recent rise in core inflation measures and generally, if subtly, pooh-poohed the chances of an April interest rate hike at a speech to the Economi