The euro zone has struggled mightily in recent years, with its economy shrinking in both 2012 and 2013. Now it faces a new worry. Inflation in the euro zone has fallen to a 0.4% annualized rate, well below the target of close to 2% set by the European Central Bank (ECB) and close to outright deflation. The dangers of high inflation (a sustained rise in the prices of goods and services throughout the economy) are well known: it reduces the value of people’s savings and can make individuals and businesses reluctant to invest. So shouldn’t deflation (a decline in prices) be beneficial? Not exactly.