Phone companies and the makers of consumer staples were the biggest decliners, dropping 1 percent and 0.4 percent respectively.
But studies like Fiocco's suggest that it may be possible to turn "decliners" into "maintainers" by encouraging social and intellectual engagement.
Asia markets closed mostly lower Friday, with energy and banking stocks notable decliners, as ongoing concerns over Europe's debt crisis kept investors sidelined.
Greece's four biggest lenders were the biggest decliners on the Dow Jones European banking stocks index on Wednesday: National Bank, EFG Eurobank, Alpha Bank and Piraeus Bank.
Energy and financial stocks were among the benchmark's biggest decliners.
Bank of America was even weaker, losing 2.7% to lead the Dow decliners after The Wall Street Journal reported that the bank was willing to retreat from some parts of the country if its financial problems deepen.
Yield spreads between Greek and German ten-year government bonds (the European benchmark) widened to 252 basis points on Wednesday, while the Athens Composite Shares index fell by 2.4% in afternoon trading, with Greek banks some of the biggest decliners.
HeartWare rose on an analysis presented at the annual meeting of the American Heart Association that showed its device for helping the hearts of transplant patients pump may outperform that of rival Thoratec, which was one of the biggest decliners.
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The biggest of the 16 decliners: the Houston Astros, who fell below 20, 000 fans a game during this lost season (down 5, 600), and the Minnesota Twins, down 4, 700 to 34, 300 a game, a club struggling on the field while the novelty of its new park wears off in year three.
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