“Faced, for example, with a difficult problem to solve—“Will this stock keep going up?”—many investors consult a chart of recent price performance. If the trend line slopes upward, then they immediately answer “Yes,” without realizing that their reflexive system has tricked them into answering an entirely different question. All the chart really shows is the answer to a much easier problem: “Has this stock been going up?” People in this kind of situation “are not confused about the question they are trying to answer,” says Kahneman. “They simply fail to notice that they are answering a different one.”