In the fifth century, a man named Arenius determined to live a holy life. So he abandoned the conforms of Egyptian society to follow an austere lifestyle in the desert. Yet whenever he visited the great city of Alexandria, he spent time wandering through its bazaars. Asked why, he explained that his heart rejoiced at the sight of all the things he didn't need.

Those of us who live in a society flooded with goods and gadgets need to ponder the example of that desert dweller. A typical supermarket in the United States in 1976 stocked 9,000 articles; today it carries nearly 40,000. How many of them are absolutely essential? How many superfluous?