Some years ago, the distinguished international-trade economist Jagdish Bhagwati was visiting Cornell University, giving a lecture to graduate students during the day and debating Ralph Nader on free trade that evening. During his lecture, Prof. Bhagwati asked how many of the graduate students would be attending that evening's debate. Not one hand went up.

Amazed, he asked why. The answer was that the economics students considered it to be a waste of time. The kind of silly stuff that Ralph Nader was saying had been refuted by economists ages ago. The net result was that the audience for the debate consisted of people largely illiterate in economics and they cheered for Mr. Nader.