The scene on this date in 1945 at Gimbel’s department store in New York City was shopping chaos. Big ads the day before had trumpeted the first sale in the U.S. of a new writing instrument that guaranteed it would write for two years without refilling — the ballpoint pen. By the end of the day, the store had sold its entire stock of 10,000 at $12.50 each. The idea of the ballpoint pen was first patented in 1888 by John Loud of Massachusetts, who never made any pens. Now, ballpoints are the standard. Vast selections are offered by the nation’s 7,400 office supply stores, which employ some 94,000 workers. You can find current data on the country’s economy by downloading the ‘America’s Economy’ mobile application at <www.census.gov/mobile>.