A man piloting a hot-air balloon discovered he had travelled far off course. He took the balloon down to a lower altitude, where he saw that he was above an office building. A man outside the building saw the balloonist and waved. The balloonist shouted, “Excuse me, can you tell me where I am?” The man yelled back, “You’re in a hot-air balloon, about 150 feet above the headquarters of this investment bank.” The balloonist replied, “You must be a forecaster at the investment bank, then.” Obviously surprised, the man said, “Yes, I am! How did you know that?” “Well,” said the balloonist, “what
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