All-night drugstores and supermarkets are becoming more commonplace in the U.S. these days. Another kind of commerce may also have a nocturnal glimmer: stock trading. Last week officials of both the New York Stock Exchange and the American Stock Exchange said they were taking the first look at the possibility of expanding trading hours beyond the current 10 a.m. to 4 p.m., which have prevailed for a decade.
If it happens, any such change would be phased in gradually. But the idea of stock around the clock has a logical appeal. A large share of corporate business is increasingly international, occurring...
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