In the final round, they were still only 17 percent accurate. The thirty-five additional pieces of information did, however, move their confidence level to 34 percent. All of the extra information made them no more accurate but a lot more confident. Confidence increases faster than accuracy. “The trouble with too much information,” Robinson told me, “is you can’t reason with it.” It only feeds confirmation bias. We ignore additional information that doesn’t agree with our assessment, and gain confidence from additional information that does.
