Inflation in the South American country of Argentina has risen past 100 percent for the first time since 1991, according to the government’s latest consumer price index. But for much of the last century, its market has been notoriously volatile, with a debt crisis in the 1980s spurring chronic hyperinflation throughout that decade. Another shopper, 50-year-old Patricia Quiroga, expressed frustration at politicians’ seeming inability to curtail the inflation