A successful businessman, visiting his alma mater, dropped in on the economics professor. Recalling that he used to have trouble with economics exams, he asked

A successful businessman, visiting his alma mater, dropped in on the economics professor. Recalling that he used to have trouble with economics exams, he asked to see some of the current papers. Noting them casually, he observed, “These are the same old questions!” “Yes,” agreed the prof, “we never change the questions.” “But,” objected the visitor, “don’t you know the students will pass the questions on from class to class?” “Certainly,” was the bland response. “But in economics we are constantly changing the answers.”