A bash for confidence indexes

Every month the University of Michigan and the Conference Board conduct a survey of households’ confidence on the state of the economy. Each pollster asks several questions and summarizes the results with an index, which is closely watched for signs of consumer distress. Last November, the Michigan index fell by 4.8 points from October; the Conference Board Index dipped by 7.9 points. Supposedly this is bad news because worried consumers are thrifty consumers. Don’t let the surveys fool you: they are almost complete rubbish — unless you know how to use them.