Chains do more than bargain down prices from suppliers or divide fixed costs across a lot of units. They rapidly spread economic discovery - the scarce and costly knowledge of what retail concepts and operational innovations actually work.

Society needs both parents and nonparents, both the work party and the home party. While raising children is the most important work most people will do, not everyone is cut out for parenthood. And, as many a childless teacher has proved, raising kids is not the only important contribution a person can make to their future.

People without children do have the freedom to do things that caring parents with dependent kids can't - to work long hours, to travel frequently, to relocate, and to do all these things on short notice if necessary. In return, they can achieve positions that devoted parents can't.

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