The article Krugman referred to is The Rising Threat of Deflation. Here are a few snips highlighting Makin's and Krugman's concern over prices.
U.S. year-over-year core inflation has dropped to 0.9 percent—its lowest level in forty-four years. The six-month annualized core consumer price index inflation level has dropped even closer to zero, at 0.4 percent. Europe’s year-over-year core inflation rate has fallen to 0.8 percent—the lowest level ever reported in the series that began in 1991. Heavily indebted Spain’s year-over-year core inflation rate is down to 0.1 percent. Ireland’s deflation rate is 2.7 percent. As commodity prices slip, inflation will become deflation globally in short order....